From a05506ae34860cc93426e27a182e908bd36e3b4f Mon Sep 17 00:00:00 2001
From: Claude <noreply@anthropic.com>
Date: Mon, 24 Aug 2026 11:40:13 +0000
Subject: [PATCH 1/3] feat(spec): retire page.components[].responsive (ADR-0049
 D2) and repair the four redirect texts (#11027)
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

The last carrier of the ResponsiveConfig layout block measured dead across
both repos (zero callers of useResponsiveConfig / ResponsiveProtocol), so the
key is a retiredKey() tombstone and the orphaned value schemas
(ResponsiveConfigSchema, the two breakpoint maps, BreakpointName) leave with
it. Every shipped text that prescribed the key as the live alternative — the
#4876 widget tombstone, the generated references, the upgrade-guide prose,
the protocol-17 migration rationale, the conversion summary, and the
dashboard liveness note — is corrected to point at responsiveStyles
(ADR-0065). ADR-0087: retired-key + retired-def entries under protocol 18 and
the page-component-responsive-removed conversion, wired into the step-18
chain.

Co-Authored-By: Claude <noreply@anthropic.com>
---
 .../page-component-responsive-removed.md      | 106 ++++++
 content/docs/protocol/objectui/layout-dsl.mdx |  23 +-
 content/docs/references/index.mdx             |  10 +-
 content/docs/references/ui/dashboard.mdx      |   2 +-
 content/docs/references/ui/page.mdx           |   2 +-
 content/docs/references/ui/responsive.mdx     |  72 +---
 content/docs/ui/pages.mdx                     |   2 +-
 ...07-unknown-key-strictness-ledger.counts.md |  14 +-
 docs/protocol-upgrade-guide.md                |   4 +-
 packages/spec/api-surface/ui.json             |   7 -
 packages/spec/authorable-surface/ui.json      |  18 +-
 packages/spec/export-origins/ui.json          |   7 -
 packages/spec/json-schema.manifest/ui.json    |   4 -
 packages/spec/liveness/dashboard.json         |   4 +-
 packages/spec/liveness/page.json              |   4 +-
 packages/spec/spec-changes.json               |   4 +-
 packages/spec/src/conversions/registry.ts     | 105 +++++-
 .../18.ui__BreakpointColumnMap.ts             |   8 +
 .../retired-defs/18.ui__BreakpointName.ts     |  11 +
 .../retired-defs/18.ui__BreakpointOrderMap.ts |   8 +
 .../retired-defs/18.ui__ResponsiveConfig.ts   |  14 +
 .../18.ui__PageComponent__responsive.ts       |  28 ++
 packages/spec/src/migrations/registry.ts      |  89 ++++-
 .../src/type-alias-convention.pin.test.ts     |  21 +-
 packages/spec/src/ui/dashboard.test.ts        |  39 +--
 packages/spec/src/ui/dashboard.zod.ts         |  34 +-
 .../ui/interaction-config-retirement.test.ts  |   7 +-
 packages/spec/src/ui/page.test.ts             |  49 ++-
 packages/spec/src/ui/page.zod.ts              |  31 +-
 packages/spec/src/ui/responsive.test.ts       | 233 ++-----------
 packages/spec/src/ui/responsive.zod.ts        | 313 ++++--------------
 .../src/ui/widget-i18n-retirement.test.ts     |   3 +-
 skills/objectstack-ui/references/_index.md    |   2 +-
 33 files changed, 622 insertions(+), 656 deletions(-)
 create mode 100644 .changeset/page-component-responsive-removed.md
 create mode 100644 packages/spec/src/migrations/entries/retired-defs/18.ui__BreakpointColumnMap.ts
 create mode 100644 packages/spec/src/migrations/entries/retired-defs/18.ui__BreakpointName.ts
 create mode 100644 packages/spec/src/migrations/entries/retired-defs/18.ui__BreakpointOrderMap.ts
 create mode 100644 packages/spec/src/migrations/entries/retired-defs/18.ui__ResponsiveConfig.ts
 create mode 100644 packages/spec/src/migrations/entries/retired-keys/18.ui__PageComponent__responsive.ts

diff --git a/.changeset/page-component-responsive-removed.md b/.changeset/page-component-responsive-removed.md
new file mode 100644
index 0000000000..e25f43fa76
--- /dev/null
+++ b/.changeset/page-component-responsive-removed.md
@@ -0,0 +1,106 @@
+---
+"@objectstack/spec": minor
+---
+
+feat(spec): retire `page.components[].responsive` and the `ResponsiveConfig` layout vocabulary; repair every shipped text that prescribed it (#11027, ADR-0049 D2)
+
+<!-- adr-0087: registered page-component-responsive-removed -->
+
+**BREAKING** accept-set narrowing, landing after the v17.0.0 cut (the lockstep
+launch-window convention ships it as `minor`; the migration prescription is
+registered under protocol major 18, where `os migrate meta` users will look).
+
+`page.components[].responsive` was the LAST carrier of the per-breakpoint
+LAYOUT block (`ResponsiveConfig`: grid columns / visibility / display order on
+the Tailwind `xs…2xl` axis) — and the destination the
+`dashboard.widgets[].responsive` tombstone (#4876) prescribed verbatim as the
+live alternative ("which objectui `useResponsiveConfig` really does read").
+Measured across objectstack + objectui with the tsc-probe methodology
+(positive and negative controls; objectui `3b147a367`, objectstack
+`8d21f7a76`): that claim was false. objectui's two complete, published
+implementations of the contract — `useResponsiveConfig` (`@object-ui/mobile`)
+and `ResponsiveProtocol` (`@object-ui/core`) — had ZERO callers, nothing in
+either repo read `.responsive` off a page component, objectui's own
+`BaseSchema` node interface never declared the key, and zero authored
+instances exist. An author following the shipped prescription moved an inert
+key to an inert key and was told it now works. Identical disposition to
+`view.responsive` (#3896) and `dashboard.widgets[].responsive` (#4876) on
+identical evidence.
+
+**What is refused:** an authored `responsive` on a page component. The key is
+a `retiredKey()` tombstone, so authoring it is a `tsc` error and a parse error
+carrying the prescription.
+
+**What leaves with it:** `ResponsiveConfigSchema` / `ResponsiveConfig`,
+`BreakpointColumnMapSchema` / `BreakpointColumnMap`,
+`BreakpointOrderMapSchema` / `BreakpointOrderMap`, and the `BreakpointName`
+enum — no other authorable carrier existed, and an exported value schema with
+no consumer reads as a capability (#3950; the `PerformanceConfigSchema`
+precedent). Importing any of them is TS2305 from this release.
+
+**What stays:** `responsiveStyles` (ADR-0065, `ResponsiveStylesSchema` /
+`StyleMapSchema`) — the per-breakpoint channel objectui really compiles to
+id-scoped CSS — is untouched and is what every repaired text now points at.
+
+The redirect repair (the reason this ships as one change): four author-facing
+surfaces shipped the false redirect and are corrected together — the #4876
+tombstone prescription (`dashboard.zod.ts`), the generated widget reference
+page, the protocol upgrade guide prose, and the protocol-17 migration
+rationale that `os migrate meta --from 16` prints. The `dashboard.json`
+liveness note and the #4876 conversion summary carried the same claim and are
+corrected too; `responsive.zod.ts`'s `hidden → hiddenOn` alias curation, which
+justified itself by `useResponsiveConfig`'s return shape, leaves with the
+schema that hosted it.
+
+The retirement kit:
+
+- `retiredKey()` tombstone at the schema (`packages/spec/src/ui/page.zod.ts`),
+  prescription pointing at `responsiveStyles` with the CSS translations for
+  `columns` / `hiddenOn` / `order`
+- ADR-0087 registration: retired-key entry `ui/PageComponent:responsive`, four
+  retired-def entries (`ui/ResponsiveConfig`, `ui/BreakpointColumnMap`,
+  `ui/BreakpointOrderMap`, `ui/BreakpointName`), and the D2 conversion
+  `page-component-responsive-removed` (protocol 18), wired into the step-18
+  chain — `os migrate meta --from 17` strips the key from authored pages at
+  every component position, region, slot, or nested container (pure lossless
+  delete; it never had an effect to lose)
+- pin tests (`page.test.ts` — refusal pin asserts the prescription; a positive
+  pin parses a component without the key and asserts `responsiveStyles`
+  survives; `dashboard.test.ts`'s #4876 pins now assert the corrected
+  prescription instead of the false redirect)
+- `ResponsiveStylesSchema` guidance for `columns` / `hiddenOn` / `order` now
+  names the retirement and the CSS that IS applied, instead of prescribing the
+  dead sibling key
+- generated baselines/docs follow the schema (authorable surface, JSON-schema
+  manifest, api-surface, export-origins, spec-changes, upgrade guide,
+  reference docs, skill references)
+- objectui's two dead consumer implementations are the other half of this
+  measurement and are queued under objectui#4773 (this package's texts no
+  longer point authors at them)
+
+## FROM → TO
+
+```ts
+// before — parsed green; no renderer ever applied any of it
+{
+  type: 'element:text',
+  id: 'kpi_label',
+  responsive: {
+    columns: { xs: 12, lg: 4 },
+    order: { xs: 2, lg: 1 },
+    hiddenOn: ['xs'],
+  },
+}
+
+// after — express per-breakpoint behaviour as scoped CSS (ADR-0065), which
+// objectui compiles and applies (desktop-first buckets)
+{
+  type: 'element:text',
+  id: 'kpi_label',
+  responsiveStyles: {
+    large: { gridColumn: 'span 4', order: '1' },
+    small: { gridColumn: 'span 12', order: '2' },
+    xsmall: { display: 'none' },
+  },
+}
+```
diff --git a/content/docs/protocol/objectui/layout-dsl.mdx b/content/docs/protocol/objectui/layout-dsl.mdx
index 73642ff923..0b2e0c53fc 100644
--- a/content/docs/protocol/objectui/layout-dsl.mdx
+++ b/content/docs/protocol/objectui/layout-dsl.mdx
@@ -791,22 +791,6 @@ interface FormField {
 }
 ```
 
-### Responsive Columns
-
-{/* os:check */}
-```typescript
-// Source: packages/spec/src/ui/responsive.zod.ts (BreakpointColumnMapSchema)
-// Grid columns (1-12) per named breakpoint. All entries optional.
-interface ResponsiveColumns {
-  xs?: number;    // ~480px
-  sm?: number;    // ~640px
-  md?: number;    // ~768px
-  lg?: number;    // ~1024px
-  xl?: number;    // ~1280px
-  '2xl'?: number; // ~1536px
-}
-```
-
 ### Visibility Rule
 
 Visibility is a single **CEL expression** string, not a structured rule object.
@@ -844,8 +828,9 @@ error names the offending key and, when it looks like a visibility predicate,
 points you back at `visibleWhen`.
 
 Breakpoint-based show/hide is handled separately via the component's
-`responsive.hiddenOn` array (e.g. `hiddenOn: ['xs', 'sm']`), see
-`packages/spec/src/ui/responsive.zod.ts`.
+`responsiveStyles` scoped CSS (ADR-0065), e.g. `xsmall: { display: 'none' }` —
+see `packages/spec/src/ui/responsive.zod.ts`. (The former `responsive.hiddenOn`
+layout key was retired in v17.x; no renderer ever applied it.)
 
 #### Position-gated visibility
 
@@ -1032,4 +1017,4 @@ block. See
 
 - [Page Reference](/docs/references/ui/page) - Page, region, and component schemas
 - [View Reference](/docs/references/ui/view) - Form, list, kanban, and calendar views
-- [Responsive Reference](/docs/references/ui/responsive) - Breakpoint layout and scoped responsive styles
+- [Responsive Reference](/docs/references/ui/responsive) - Per-breakpoint scoped responsive styles (ADR-0065)
diff --git a/content/docs/references/index.mdx b/content/docs/references/index.mdx
index 5f74ebfba9..5c963ac4f4 100644
--- a/content/docs/references/index.mdx
+++ b/content/docs/references/index.mdx
@@ -1,6 +1,6 @@
 ---
 title: Protocol Reference
-description: Every schema published by @objectstack/spec — 1586 schemas across 14 protocol modules
+description: Every schema published by @objectstack/spec — 1582 schemas across 14 protocol modules
 ---
 
 {/* ⚠️  AUTO-GENERATED — DO NOT EDIT. Run build-docs.ts to regenerate. Hand-written docs live in the module folders under content/docs/. */}
@@ -32,8 +32,8 @@ counts are sums of the rows they head. Regenerate with
 | [Shared Protocol](/docs/references/shared) | 8 | 31 | Primitives used across every protocol — identifiers, HTTP, expressions, error maps, enums. |
 | [Studio Protocol](/docs/references/studio) | 3 | 35 | Studio designer metadata — the authoring surfaces for the protocols above. |
 | [System Protocol](/docs/references/system) | 36 | 287 | The runtime environment — logging, jobs, cache, metrics, notifications, i18n and compliance. |
-| [UI Protocol](/docs/references/ui) | 16 | 156 | Apps, pages, views, dashboards, reports, actions and themes — the ObjectUI layer. |
-| **Total** | **199** | **1586** | 14 protocol modules |
+| [UI Protocol](/docs/references/ui) | 16 | 152 | Apps, pages, views, dashboards, reports, actions and themes — the ObjectUI layer. |
+| **Total** | **199** | **1582** | 14 protocol modules |
 
 ---
 
@@ -365,7 +365,7 @@ The runtime environment — logging, jobs, cache, metrics, notifications, i18n a
 
 ## UI Protocol
 
-**Source:** `packages/spec/src/ui/` · **Import:** `@objectstack/spec/ui` · **16 pages, 156 schemas**
+**Source:** `packages/spec/src/ui/` · **Import:** `@objectstack/spec/ui` · **16 pages, 152 schemas**
 
 Apps, pages, views, dashboards, reports, actions and themes — the ObjectUI layer.
 
@@ -384,7 +384,7 @@ Apps, pages, views, dashboards, reports, actions and themes — the ObjectUI lay
 | [`notification.zod.ts`](/docs/references/ui/notification) | `NotificationPosition`, `NotificationSeverity`, `NotificationType` |
 | [`page.zod.ts`](/docs/references/ui/page) | `ElementDataSource`, `InterfacePageConfig`, `Page`, `PageComponent`, `PageComponentType`, `PageRegion`, `PageType`, `PageVariable` |
 | [`report.zod.ts`](/docs/references/ui/report) | `JoinedReportBlock`, `Report`, `ReportChart`, `ReportSort`, `ReportType` |
-| [`responsive.zod.ts`](/docs/references/ui/responsive) | `BreakpointColumnMap`, `BreakpointName`, `BreakpointOrderMap`, `ResponsiveConfig`, `ResponsiveStyles`, `StyleMap` |
+| [`responsive.zod.ts`](/docs/references/ui/responsive) | `ResponsiveStyles`, `StyleMap` |
 | [`sharing.zod.ts`](/docs/references/ui/sharing) | `SharingConfig` |
 | [`view.zod.ts`](/docs/references/ui/view) | `AddRecordConfig`, `AppearanceConfig`, `CalendarConfig`, `ColumnPrefix`, `ColumnSummary`, `ColumnSummaryConfig`, `FormButtonConfig`, `FormField`, `FormFieldPublicPicker`, `FormSection`, `FormView`, `GalleryConfig`, `GanttConfig`, `GanttQuickFilter`, `GroupingConfig`, `GroupingField`, `HttpMethodSubset`, `HttpRequest`, `KanbanConfig`, `ListChartConfig`, `ListColumn`, `ListMapConfig`, `ListView`, `NavigationConfig`, `NavigationMode`, `ObjectListView`, `ObjectUserFilters`, `PaginationConfig`, `RowColorConfig`, `RowHeight`, `SelectionConfig`, `TimelineConfig`, `TreeConfig`, `UserActionsConfig`, `UserFilterField`, `UserFilters`, `View`, `ViewData`, `ViewFilterRule`, `ViewItem`, `ViewItemName`, `ViewItemWire`, `ViewKind`, `ViewScope`, `ViewSharing`, `ViewTab`, `VisualizationType` |
 
diff --git a/content/docs/references/ui/dashboard.mdx b/content/docs/references/ui/dashboard.mdx
index d4dc5f3969..ffb11d642c 100644
--- a/content/docs/references/ui/dashboard.mdx
+++ b/content/docs/references/ui/dashboard.mdx
@@ -110,7 +110,7 @@ Dashboard header action
 | **options** | `{ dateGranularity?: Enum<'day' \| 'week' \| 'month' \| 'quarter' \| 'year'>; sortBy?: string; sortOrder?: Enum<'asc' \| 'desc'>; limit?: integer; … } & Record<string, any>` | optional | Widget specific configuration |
 | **filterBindings** | `Record<string, string \| false>` | optional | Per-widget dashboard-filter bindings: filter name → this widget's field, or false to opt out |
 | **suppressWarnings** | `string[]` | optional | Build diagnostic rule ids suppressed on this widget |
-| **responsive** | `never` | optional | [REMOVED] `dashboard.widgets[].responsive` was removed in @objectstack/spec 17.0.0 (#4876, ADR-0049 D2) — no renderer ever read it, so per-widget breakpoint overrides were never applied: the value parsed, validated, and then did nothing. The dashboard grid reflows by its own layout rules (`columns` + `gap` on the dashboard, the `layout` box on each widget). Delete the key. The shared `ResponsiveConfig` shape is NOT gone — it stays live on `page.components[].responsive`, which objectui `useResponsiveConfig` really does read; move the layout there if you need breakpoint behaviour today. Run `os migrate meta --from 16` to list the mechanical edits for existing sources; apply them by hand. |
+| **responsive** | `never` | optional | [REMOVED] `dashboard.widgets[].responsive` was removed in @objectstack/spec 17.0.0 (#4876, ADR-0049 D2) — no renderer ever read it, so per-widget breakpoint overrides were never applied: the value parsed, validated, and then did nothing. The dashboard grid reflows by its own layout rules (`columns` + `gap` on the dashboard, the `layout` box on each widget). Delete the key. This message used to point at `page.components[].responsive` as the live home of the shared `ResponsiveConfig` shape; that key was measured equally unread and removed with the shape in #11027. For breakpoint behaviour that IS applied, use `responsiveStyles` on a page component (ADR-0065) — per-breakpoint CSS maps compiled to id-scoped CSS at render. Run `os migrate meta --from 16` to list the mechanical edits for existing sources; apply them by hand. |
 | **aria** | `never` | optional | [REMOVED] `dashboard.widgets[].aria` was removed in @objectstack/spec 17.0.0 (#5010, ADR-0049 D2) — no renderer ever applied it, so ARIA attributes declared on a widget silently did not reach the DOM: the key promised accessibility compliance it did not deliver. This is the same removal the dashboard-level `aria` got in 17.0.0 (#3896). Delete the key. The dashboard renderer emits its own `aria-*` attributes for the widget grid; author a `title` (and `description`) on the widget instead — those ARE what the renderer labels the card with. The shared `AriaProps` shape is NOT gone: it stays live on `page.aria`, `page.components[].aria` and the list view `aria`. Run `os migrate meta --from 16` to list the mechanical edits for existing sources; apply them by hand. |
 
 ### Allowed Values: `DashboardWidget.type`
diff --git a/content/docs/references/ui/page.mdx b/content/docs/references/ui/page.mdx
index 09e5b6967e..4baab160bb 100644
--- a/content/docs/references/ui/page.mdx
+++ b/content/docs/references/ui/page.mdx
@@ -116,7 +116,7 @@ Interface-level page configuration (Airtable parity)
 | **visibleWhen** | `string \| { dialect: Enum<'cel' \| 'cron' \| 'template'>; source?: string; ast?: any; meta?: object }` | optional | Visibility predicate (CEL) — component rendered only when TRUE. Contract-bound roots: `record`, `current_user` (ADR-0068 aliases `user` / `ctx.user` — one object, three spellings), and page state as `page.<var>`. The shipping renderer additionally mounts `app`, `features`, `os.user` and binds `data` to the data-source ADAPTER here — renderer behaviour, NOT contract-guaranteed (ADR-0068 rules the user object only). ⚠️ `data` is surface-dependent: on a `page:tabs` item `visibleWhen` it is the record ROW instead. e.g. "page.selectedProjectId != ''" |
 | **visibility** | `string \| { dialect: Enum<'cel' \| 'cron' \| 'template'>; source?: string; ast?: any; meta?: object }` | optional | [DEPRECATED → `visibleWhen`] Visibility predicate (CEL). Normalized to `visibleWhen` at parse. |
 | **dataSource** | `{ object: string; view?: string; filter?: any; sort?: object[]; … }` | optional | Per-element data binding for multi-object pages |
-| **responsive** | `{ breakpoint?: Enum<'xs' \| 'sm' \| 'md' \| 'lg' \| 'xl' \| '2xl'>; hiddenOn?: Enum<'xs' \| 'sm' \| 'md' \| 'lg' \| 'xl' \| '2xl'>[]; columns?: object; order?: object }` | optional | Responsive layout configuration |
+| **responsive** | `never` | optional | [REMOVED] `page.components[].responsive` was removed in @objectstack/spec 17 (#11027, ADR-0049 D2) — no renderer ever read it, so per-breakpoint layout overrides (columns/order/visibility) parsed, validated, and then did nothing. Delete the key. For breakpoint behaviour that IS applied, use the sibling `responsiveStyles` (ADR-0065) — per-breakpoint CSS maps compiled to id-scoped CSS at render, e.g. `responsiveStyles: { xsmall: { display: 'none' } }` to hide a component on the narrowest screens. Run `os migrate meta --from 17` to list the mechanical edits for existing sources; apply them by hand. |
 | **aria** | `{ ariaLabel?: string \| Record<string, string>; ariaDescribedBy?: string; role?: string }` | optional | ARIA accessibility attributes |
 
 
diff --git a/content/docs/references/ui/responsive.mdx b/content/docs/references/ui/responsive.mdx
index 156c84049c..5431b66c56 100644
--- a/content/docs/references/ui/responsive.mdx
+++ b/content/docs/references/ui/responsive.mdx
@@ -12,79 +12,13 @@ description: Responsive protocol schemas
 ## TypeScript Usage
 
 ```typescript
-import { BreakpointColumnMapSchema, BreakpointName, BreakpointOrderMapSchema, ResponsiveConfigSchema, ResponsiveStylesSchema, StyleMapSchema } from '@objectstack/spec/ui';
-import type { BreakpointColumnMap, BreakpointName, BreakpointOrderMap, ResponsiveConfig, ResponsiveStyles, StyleMap } from '@objectstack/spec/ui';
+import { ResponsiveStylesSchema, StyleMapSchema } from '@objectstack/spec/ui';
+import type { ResponsiveStyles, StyleMap } from '@objectstack/spec/ui';
 
 // Validate data
-const result = BreakpointColumnMapSchema.parse(data);
+const result = ResponsiveStylesSchema.parse(data);
 ```
 
----
-
-## BreakpointColumnMap
-
-Grid columns per breakpoint (1-12)
-
-### Properties
-
-| Property | Type | Required | Description |
-| :--- | :--- | :--- | :--- |
-| **xs** | `number` | optional |  |
-| **sm** | `number` | optional |  |
-| **md** | `number` | optional |  |
-| **lg** | `number` | optional |  |
-| **xl** | `number` | optional |  |
-| **2xl** | `number` | optional |  |
-
-
----
-
-## BreakpointName
-
-### Allowed Values
-
-* `xs`
-* `sm`
-* `md`
-* `lg`
-* `xl`
-* `2xl`
-
-
----
-
-## BreakpointOrderMap
-
-Display order per breakpoint
-
-### Properties
-
-| Property | Type | Required | Description |
-| :--- | :--- | :--- | :--- |
-| **xs** | `number` | optional |  |
-| **sm** | `number` | optional |  |
-| **md** | `number` | optional |  |
-| **lg** | `number` | optional |  |
-| **xl** | `number` | optional |  |
-| **2xl** | `number` | optional |  |
-
-
----
-
-## ResponsiveConfig
-
-Responsive layout configuration
-
-### Properties
-
-| Property | Type | Required | Description |
-| :--- | :--- | :--- | :--- |
-| **breakpoint** | `Enum<'xs' \| 'sm' \| 'md' \| 'lg' \| 'xl' \| '2xl'>` | optional | Minimum breakpoint for visibility |
-| **hiddenOn** | `Enum<'xs' \| 'sm' \| 'md' \| 'lg' \| 'xl' \| '2xl'>[]` | optional | Hide on these breakpoints |
-| **columns** | `{ xs?: number; sm?: number; md?: number; lg?: number; … }` | optional | Grid columns per breakpoint |
-| **order** | `{ xs?: number; sm?: number; md?: number; lg?: number; … }` | optional | Display order per breakpoint |
-
-
 ---
 
 ## ResponsiveStyles
diff --git a/content/docs/ui/pages.mdx b/content/docs/ui/pages.mdx
index c7d8a136d3..47cadf0fc4 100644
--- a/content/docs/ui/pages.mdx
+++ b/content/docs/ui/pages.mdx
@@ -188,7 +188,7 @@ The `type` field is a union of the standard `PageComponentType` enum and any cus
 - **AI:** `ai:chat_window`, `ai:suggestion`
 - **Elements:** `element:text`, `element:number`, `element:image`, `element:divider`, `element:button`, `element:record_picker`, `element:text_input` (`element:filter` and `element:form` were retired in v17.x — no renderer ever shipped for either. List surfaces own their filtering via a view's `userFilters` quick-filter bar or the list toolbar's filter builder; for forms use the object-bound `object-form` block, which is rendered and designer-publishable)
 
-Components may also carry `dataSource` (per-element object binding for multi-object pages), `responsive`, and `aria` configuration. Custom string types are also accepted for project-specific widgets.
+Components may also carry `dataSource` (per-element object binding for multi-object pages), `responsiveStyles` (per-breakpoint scoped CSS, ADR-0065), and `aria` configuration. Custom string types are also accepted for project-specific widgets. (The former `responsive` layout block was retired in v17.x — no renderer ever applied it; see the upgrade guide.)
 
 ## Variables
 
diff --git a/docs/audits/2026-07-unknown-key-strictness-ledger.counts.md b/docs/audits/2026-07-unknown-key-strictness-ledger.counts.md
index 0b75db4377..81f80c1aa1 100644
--- a/docs/audits/2026-07-unknown-key-strictness-ledger.counts.md
+++ b/docs/audits/2026-07-unknown-key-strictness-ledger.counts.md
@@ -21,7 +21,7 @@ regenerate.
 | Measure | Value |
 |---|---|
 | Triaged directories | 5 |
-| Object sites in them | 439 |
+| Object sites in them | 436 |
 | Still-open (strip) sites | 124 |
 | Files carrying at least one | 22 |
 
@@ -44,12 +44,12 @@ The `strict` column is the one the campaign schedules against; it counts both th
 
 | Dir | Sites | strict | passthrough | catchall | strip |
 |---|---|---|---|---|---|
-| `ui/` | 171 | 159 | 5 | 0 | 7 |
+| `ui/` | 168 | 156 | 5 | 0 | 7 |
 | `data/` | 156 | 74 | 1 | 0 | 81 |
 | `automation/` | 65 | 42 | 0 | 0 | 23 |
 | `security/` | 20 | 7 | 0 | 0 | 13 |
 | `studio/` | 27 | 27 | 0 | 0 | 0 |
-| **total** | **439** | **309** | **6** | **0** | **124** |
+| **total** | **436** | **306** | **6** | **0** | **124** |
 
 ## File-level triage — site counts
 
@@ -72,11 +72,11 @@ classify and is not listed (it becomes reportable the day it grows its first sit
 | `i18n.zod.ts` | 1 |
 | `page.zod.ts` | 7 |
 | `report.zod.ts` | 3 |
-| `responsive.zod.ts` | 4 |
+| `responsive.zod.ts` | 1 |
 | `sharing.zod.ts` | 1 |
 | `view.zod.ts` | 57 |
 | `widget.zod.ts` | 1 |
-| **total** | **171** |
+| **total** | **168** |
 
 ### `data/` — sites
 
@@ -155,7 +155,7 @@ over it is here.
 
 ### `ui/` — open
 
-**7 strip of 171**, in 4 file(s).
+**7 strip of 168**, in 4 file(s).
 
 | File | Strip | Sites |
 |---|---|---|
@@ -163,7 +163,7 @@ over it is here.
 | `app.zod.ts` | 1 | 18 |
 | `view.zod.ts` | 4 | 57 |
 | `widget.zod.ts` | 1 | 1 |
-| **total** | **7** | **171** |
+| **total** | **7** | **168** |
 
 | Bucket | Sites |
 |---|---|
diff --git a/docs/protocol-upgrade-guide.md b/docs/protocol-upgrade-guide.md
index 819b3bb060..702e15ee78 100644
--- a/docs/protocol-upgrade-guide.md
+++ b/docs/protocol-upgrade-guide.md
@@ -194,7 +194,7 @@ Finally it removes the script-body capability token 'crypto.hash' (#4391). Four
 
 It also removes `connector.rateLimitConfig` and its whole shape (#4911). This one is not "declared but unread" — it is declared but UNIMPLEMENTED, one step worse. The only token bucket the platform owns (runtime `security/rate-limit.ts`) is INBOUND: the dispatcher calls `consume(key)` on a request fingerprint and answers 429. Nothing anywhere throttles the calls a connector makes OUT, and no provider — `connector-rest`, `connector-openapi`, `connector-mcp`, `connector-slack` — reads the key or has a seam that could. So `strategy`, `maxRequests`, `windowSeconds`, `burstCapacity`, `respectUpstreamLimits` and `rateLimitHeaders` parsed cleanly and capped nothing, on a surface where the author believed they had bounded their spend against a third party's quota. `ConnectorRateLimitConfig` and the `RateLimitStrategy` enum it embedded had no other consumer and are removed with the key, so importing either is TS2305 in v17 — the #4834 shape, and the same implementation-first ruling: the vocabulary comes back WITH the engine, in one change. It is deliberately NOT converted to `shared` `RateLimitConfig`, which limits the calls others make to US; #4684 split their names for precisely this confusion, and rewriting an outbound cap into an inbound one would throttle the wrong direction. Delete the key and rate-limit where the calls are actually made — the connector provider or upstream gateway.
 
-Last, it removes `dashboard.widgets[].responsive` (#4876) — the straggler of the #3896 sweep above, which retired the literally same-named `view.responsive` on the same evidence four days earlier. Re-measured before removal: no objectui code reads `widget.responsive` (DashboardRenderer, DashboardEditor and plugin-designer name it only in comments), and there are zero authored instances repo-wide, so the conversion is expected to be a no-op on every real source — it exists so that a stored dashboard carrying the key is cleaned deterministically rather than meeting the tombstone at load. What kept it alive was not evidence but a hole in the instrument: the liveness ledger declares no `children` on `dashboard.widgets`, and the walk only drills one level through an explicit `children`, so no widget-level key has ever been classified at all (filed as #4956, fixed separately). The removal is deliberately narrow — it takes the widget EMBED, not the shape. `ResponsiveConfig` stays exported and stays live on `page.components[].responsive`, which objectui `useResponsiveConfig` genuinely reads, so no import breaks and authors who need breakpoint behaviour today have somewhere real to put it. Per-widget responsive layout returns if and when a renderer implements it.
+Last, it removes `dashboard.widgets[].responsive` (#4876) — the straggler of the #3896 sweep above, which retired the literally same-named `view.responsive` on the same evidence four days earlier. Re-measured before removal: no objectui code reads `widget.responsive` (DashboardRenderer, DashboardEditor and plugin-designer name it only in comments), and there are zero authored instances repo-wide, so the conversion is expected to be a no-op on every real source — it exists so that a stored dashboard carrying the key is cleaned deterministically rather than meeting the tombstone at load. What kept it alive was not evidence but a hole in the instrument: the liveness ledger declares no `children` on `dashboard.widgets`, and the walk only drills one level through an explicit `children`, so no widget-level key has ever been classified at all (filed as #4956, fixed separately). The removal was deliberately narrow — it took the widget EMBED, not the shape, which at the time was believed live on `page.components[].responsive` via objectui `useResponsiveConfig`. CORRECTED at #11027 (2026-08): that belief measured false — the hook had zero callers, nothing read the page key either — so protocol 18 retires `page.components[].responsive` and the `ResponsiveConfig` shape with it (see the `page-component-responsive-removed` step-18 entry). Authors who need breakpoint behaviour use `responsiveStyles` (ADR-0065), the channel objectui really compiles. Per-widget responsive layout returns if and when a renderer implements it.
 
 Finally it CONVERGES `dashboard.widgets[].compareTo` (#5011) — the one entry in this step that is not a removal but a vocabulary merge, and the one whose defect was worst-shaped. The widget declared three arms with confident TSDoc; the analytics executor implements one contract, `DatasetSelection.compareTo` = `{ kind, dimension? }`, which has no `offset` in it. On the ADR-0021 dataset path the two string arms were DROPPED by the renderer (a comparison silently absent from a widget whose author asked for one) and `{ offset }` was forwarded into that contract with no dimension, so the executor threw `compareTo requires a timeDimension "undefined"` and errored the whole widget. All three arms worked on the legacy inline chart path. Same key, two fates — and the failing one was the path the spec itself calls canonical, which is why this ranks above an ordinary declared-but-unread key: the documentation was actively teaching a shape that crashes. The widget now declares the executor's own words, so `declared = enforced` holds by construction with no second vocabulary left to drift. `dimension` is optional and resolved by the EXECUTOR (one dated time dimension → that one; zero or several → a loud error naming the candidates), which is a producer-side resolution rule, not the consumer-side tolerance PD #12 forbids. The bare strings and `{ offset: '1y' }` replay mechanically; every other `{ offset }` duration is a semantic TODO below, because `previousPeriod` shifts by the resolved window's own length and rewriting `7d` into it would change which rows the comparison counts. The converged slot is also union-free, which is not cosmetic: zod collapses a failed union into one bare `Invalid input` and #5014 showed that curated guidance inside a union arm never reaches the author at all.
 
@@ -268,7 +268,7 @@ Finally it removes the 'pdf' member of `view.exportOptions` formats (#8010, main
 | `view-list-passthrough-keys-removed` | `view.list.striped / view.list.bordered / view.list.virtualScroll` | view list keys removed (#7176): 'striped'/'bordered'/'virtualScroll' — every measured reader copied the key forward and none applied it (pass-through-only; ADR-0049 enforce-or-remove) | retired — `migrate meta` only |
 | `view-export-options-pdf-removed` | `view.list.exportOptions / view.listViews.*.exportOptions` | list-view export format 'pdf' removed (#8010 — PDF export was declined as #1301 NOT_PLANNED; ObjectGrid dropped the declared format from the menu with only a runtime console.warn) | retired — `migrate meta` only |
 | `dashboard-inert-keys-removed` | `dashboard.aria / dashboard.performance / dashboard.widgets[].performance` | dashboard keys 'aria'/'performance' and widget 'performance' removed (#3896 close-out — no renderer applied any of them) | retired — `migrate meta` only |
-| `dashboard-widget-responsive-removed` | `dashboard.widgets[].responsive` | dashboard widget key 'responsive' removed (#4876 — no renderer ever applied per-widget breakpoint overrides; page.components[].responsive is unaffected) | retired — `migrate meta` only |
+| `dashboard-widget-responsive-removed` | `dashboard.widgets[].responsive` | dashboard widget key 'responsive' removed (#4876 — no renderer ever applied per-widget breakpoint overrides; the page.components[].responsive key this entry once deferred to was itself retired at protocol 18, #11027) | retired — `migrate meta` only |
 | `dashboard-widget-action-aria-removed` | `dashboard.widgets[].actionUrl / dashboard.widgets[].actionType / dashboard.widgets[].actionIcon / dashboard.widgets[].aria` | dashboard widget keys 'actionUrl'/'actionType'/'actionIcon' and 'aria' removed (#5010 — no renderer ever drew a per-widget action button, and widget ARIA attributes never reached the DOM; use header.actions[] and the widget title/description) | retired — `migrate meta` only |
 | `dashboard-widget-compareto-converged` | `dashboard.widgets[].compareTo` | dashboard widget 'compareTo' converged on the executor's { kind, dimension? } contract (#5011 — the bare strings and { offset: '1y' } rewrite mechanically; other { offset } durations have no faithful target and are reported, not guessed) | retired — `migrate meta` only |
 | `agent-knowledge-removed` | `agent.knowledge` | agent key 'knowledge' removed (#3896 close-out — declaring sources/indexes never scoped retrieval; restrict at the knowledge-service level) | retired — `migrate meta` only |
diff --git a/packages/spec/api-surface/ui.json b/packages/spec/api-surface/ui.json
index 73a48b4051..ff737a7990 100644
--- a/packages/spec/api-surface/ui.json
+++ b/packages/spec/api-surface/ui.json
@@ -47,11 +47,6 @@
     "AssembledViewArtifactParsed (type)",
     "AssembledViewArtifactSchema (const)",
     "AssembledViewPartition (interface)",
-    "BreakpointColumnMap (type)",
-    "BreakpointColumnMapSchema (const)",
-    "BreakpointName (type)",
-    "BreakpointOrderMap (type)",
-    "BreakpointOrderMapSchema (const)",
     "BulkActionDef (type)",
     "BulkActionDefParsed (type)",
     "BulkActionDefSchema (const)",
@@ -316,8 +311,6 @@
     "ReportSortSchema (const)",
     "ReportType (type)",
     "ResolvedActionParam (interface)",
-    "ResponsiveConfig (type)",
-    "ResponsiveConfigSchema (const)",
     "ResponsiveStyles (type)",
     "ResponsiveStylesSchema (const)",
     "RowColorConfig (type)",
diff --git a/packages/spec/authorable-surface/ui.json b/packages/spec/authorable-surface/ui.json
index b804473bed..8335d00c04 100644
--- a/packages/spec/authorable-surface/ui.json
+++ b/packages/spec/authorable-surface/ui.json
@@ -139,18 +139,6 @@
     "ui/AriaProps:ariaDescribedBy",
     "ui/AriaProps:ariaLabel",
     "ui/AriaProps:role",
-    "ui/BreakpointColumnMap:2xl",
-    "ui/BreakpointColumnMap:lg",
-    "ui/BreakpointColumnMap:md",
-    "ui/BreakpointColumnMap:sm",
-    "ui/BreakpointColumnMap:xl",
-    "ui/BreakpointColumnMap:xs",
-    "ui/BreakpointOrderMap:2xl",
-    "ui/BreakpointOrderMap:lg",
-    "ui/BreakpointOrderMap:md",
-    "ui/BreakpointOrderMap:sm",
-    "ui/BreakpointOrderMap:xl",
-    "ui/BreakpointOrderMap:xs",
     "ui/BulkActionDef:batchSize",
     "ui/BulkActionDef:confirmLabel",
     "ui/BulkActionDef:confirmText",
@@ -915,7 +903,7 @@
     "ui/PageComponent:id",
     "ui/PageComponent:label",
     "ui/PageComponent:properties",
-    "ui/PageComponent:responsive",
+    "ui/PageComponent:responsive [RETIRED]",
     "ui/PageComponent:responsiveStyles",
     "ui/PageComponent:style",
     "ui/PageComponent:type",
@@ -1082,10 +1070,6 @@
     "ui/ReportNavItem:visible",
     "ui/ReportSort:by",
     "ui/ReportSort:direction",
-    "ui/ResponsiveConfig:breakpoint",
-    "ui/ResponsiveConfig:columns",
-    "ui/ResponsiveConfig:hiddenOn",
-    "ui/ResponsiveConfig:order",
     "ui/ResponsiveStyles:large",
     "ui/ResponsiveStyles:medium",
     "ui/ResponsiveStyles:small",
diff --git a/packages/spec/export-origins/ui.json b/packages/spec/export-origins/ui.json
index df6d7b3150..70dd21043a 100644
--- a/packages/spec/export-origins/ui.json
+++ b/packages/spec/export-origins/ui.json
@@ -47,11 +47,6 @@
     "AssembledViewArtifactParsed": "src/ui/assembled-views.zod.ts#AssembledViewArtifactParsed (type)",
     "AssembledViewArtifactSchema": "src/ui/assembled-views.zod.ts#AssembledViewArtifactSchema (const)",
     "AssembledViewPartition": "src/ui/assembled-views.zod.ts#AssembledViewPartition (interface)",
-    "BreakpointColumnMap": "src/ui/responsive.zod.ts#BreakpointColumnMap (type)",
-    "BreakpointColumnMapSchema": "src/ui/responsive.zod.ts#BreakpointColumnMapSchema (const)",
-    "BreakpointName": "src/ui/responsive.zod.ts#BreakpointName (type)",
-    "BreakpointOrderMap": "src/ui/responsive.zod.ts#BreakpointOrderMap (type)",
-    "BreakpointOrderMapSchema": "src/ui/responsive.zod.ts#BreakpointOrderMapSchema (const)",
     "BulkActionDef": "src/ui/bulk-action.zod.ts#BulkActionDef (type)",
     "BulkActionDefParsed": "src/ui/bulk-action.zod.ts#BulkActionDefParsed (type)",
     "BulkActionDefSchema": "src/ui/bulk-action.zod.ts#BulkActionDefSchema (const)",
@@ -316,8 +311,6 @@
     "ReportSortSchema": "src/ui/report.zod.ts#ReportSortSchema (const)",
     "ReportType": "src/ui/report.zod.ts#ReportType (type)",
     "ResolvedActionParam": "src/ui/action-params.zod.ts#ResolvedActionParam (interface)",
-    "ResponsiveConfig": "src/ui/responsive.zod.ts#ResponsiveConfig (type)",
-    "ResponsiveConfigSchema": "src/ui/responsive.zod.ts#ResponsiveConfigSchema (const)",
     "ResponsiveStyles": "src/ui/responsive.zod.ts#ResponsiveStyles (type)",
     "ResponsiveStylesSchema": "src/ui/responsive.zod.ts#ResponsiveStylesSchema (const)",
     "RowColorConfig": "src/ui/view.zod.ts#RowColorConfig (type)",
diff --git a/packages/spec/json-schema.manifest/ui.json b/packages/spec/json-schema.manifest/ui.json
index 6174a2db03..2359646dad 100644
--- a/packages/spec/json-schema.manifest/ui.json
+++ b/packages/spec/json-schema.manifest/ui.json
@@ -16,9 +16,6 @@
     "ui/AppContextSelector",
     "ui/AppearanceConfig",
     "ui/AriaProps",
-    "ui/BreakpointColumnMap",
-    "ui/BreakpointName",
-    "ui/BreakpointOrderMap",
     "ui/BulkActionDef",
     "ui/BulkActionExecution",
     "ui/BulkActionOperation",
@@ -132,7 +129,6 @@
     "ui/ReportNavItem",
     "ui/ReportSort",
     "ui/ReportType",
-    "ui/ResponsiveConfig",
     "ui/ResponsiveStyles",
     "ui/RowColorConfig",
     "ui/RowHeight",
diff --git a/packages/spec/liveness/dashboard.json b/packages/spec/liveness/dashboard.json
index ebbdb73589..5d02d881a5 100644
--- a/packages/spec/liveness/dashboard.json
+++ b/packages/spec/liveness/dashboard.json
@@ -142,8 +142,8 @@
         },
         "responsive": {
           "status": "dead",
-          "verifiedAt": "2026-08-03",
-          "note": "The key this drill exists for. Nothing in either repo ever read `widget.responsive` — DashboardRenderer / DashboardEditor / plugin-designer name it only in comments, and objectui's one real per-breakpoint consumer (useResponsiveConfig) is fed by `page.components[].responsive`. Its literal namesake `view.list.responsive` was judged dead and removed in the 2026-07-30 #3896 sweep precisely because `view` IS drilled through `children`; this one was never asked, and survived on that silence alone. Retired 2026-08-03 via #4876 / PR #4995 (retiredKey tombstone + the protocol-17 `dashboard-widget-responsive-removed` conversion). The row stays because the tombstone keeps the key in the walked shape — the rls.priority precedent — and no authorWarn is needed: authoring it is now a tsc error and a parse error."
+          "verifiedAt": "2026-08-24",
+          "note": "The key this drill exists for. Nothing in either repo ever read `widget.responsive` — DashboardRenderer / DashboardEditor / plugin-designer name it only in comments. Its literal namesake `view.list.responsive` was judged dead and removed in the 2026-07-30 #3896 sweep precisely because `view` IS drilled through `children`; this one was never asked, and survived on that silence alone. Retired 2026-08-03 via #4876 / PR #4995 (retiredKey tombstone + the protocol-17 `dashboard-widget-responsive-removed` conversion). CORRECTED 2026-08-24 (#11027): this note used to call `useResponsiveConfig` the 'one real per-breakpoint consumer', fed by `page.components[].responsive` — measured false: that hook (and `ResponsiveProtocol`, the second implementation) had zero callers, so the page key was retired too (protocol-18 `page-component-responsive-removed`) and the tombstone here no longer prescribes it. The row stays because the tombstone keeps the key in the walked shape — the rls.priority precedent — and no authorWarn is needed: authoring it is now a tsc error and a parse error."
         },
         "aria": {
           "status": "dead",
diff --git a/packages/spec/liveness/page.json b/packages/spec/liveness/page.json
index e3780e0992..ac07f5d10e 100644
--- a/packages/spec/liveness/page.json
+++ b/packages/spec/liveness/page.json
@@ -1,6 +1,6 @@
 {
   "type": "page",
-  "_note": "PageSchema (UI). Renderers live in objectui; objectui paths are cited with the `objectui:` realm marker (in `evidence` or `note` prose) and counted, not resolved against this repo (#5623). Seeded from the Studio page-design dogfood (framework#2254/#2261/#2265). Containers (variables/regions/interfaceConfig/slots/aria) classified at top level — one drill level, no divergent sub-statuses. The removed roadmap page types (record_review/blank) and their config fields (recordReview/blankLayout) were hard-removed — no longer authorable.",
+  "_note": "PageSchema (UI). Renderers live in objectui; objectui paths are cited with the `objectui:` realm marker (in `evidence` or `note` prose) and counted, not resolved against this repo (#5623). Seeded from the Studio page-design dogfood (framework#2254/#2261/#2265). Containers (variables/regions/interfaceConfig/slots/aria) classified at top level — one drill level, no divergent sub-statuses. The removed roadmap page types (record_review/blank) and their config fields (recordReview/blankLayout) were hard-removed — no longer authorable. RETIREMENT RECORD (#11027, 2026-08-24): `regions[].components[].responsive` is a retiredKey tombstone (ADR-0049 D2) — measured dead across both repos (zero callers of either objectui consumer implementation); the shared `ResponsiveConfigSchema` left with it. The walk drills one level only, so no component-level key has a row here (`page/regions` stays RECORDED in undrilled-containers.baseline.json — #4956's page-side instance, still open for the other component keys); the checkable record of THIS retirement is the authorable-surface `ui/PageComponent:responsive [RETIRED]` row, RETIRED_KEYS_BY_MAJOR[18], and the `page-component-responsive-removed` conversion.",
   "props": {
     "source": {
       "status": "live",
@@ -50,7 +50,7 @@
       "verifiedAt": "2026-08-10",
       "evidenceScope": "cross-repo",
       "evidence": "objectui: packages/components/src/renderers/layout/page.tsx:290 branches on schema.regions, :197-204 resolves the named slots (header/sidebar/main/aside/footer) and appends the remainder below main at :211, and :157 flattens their components for the JSX-source path — measured objectui @11c1e71e",
-      "note": "region → component tree rendering (header/main/sidebar/footer). RE-CITED 2026-08-10 (#7133/#7142): same split-citation pruning as `template` — at objectui @11c1e71e the containers.tsx half names `regions` only in a comment (:798, 'page:section — thin wrapper used inside regions'). Verdict unchanged: LIVE."
+      "note": "region → component tree rendering (header/main/sidebar/footer). RE-CITED 2026-08-10 (#7133/#7142): same split-citation pruning as `template` — at objectui @11c1e71e the containers.tsx half names `regions` only in a comment (:798, 'page:section — thin wrapper used inside regions'). Verdict unchanged: LIVE. Component-level liveness stays unclassified (undrilled container, #4956); one component key carries a verdict OUTSIDE this file: `components[].responsive` is a retiredKey tombstone (#11027, ADR-0049 D2 — dead on a two-repo measurement; see the file _note)."
     },
     "isDefault": {
       "status": "live",
diff --git a/packages/spec/spec-changes.json b/packages/spec/spec-changes.json
index 1ed39ba252..2940b480fc 100644
--- a/packages/spec/spec-changes.json
+++ b/packages/spec/spec-changes.json
@@ -202,7 +202,7 @@
       },
       {
         "surface": "dashboard.widgets[].responsive",
-        "to": "dashboard widget key 'responsive' removed (#4876 — no renderer ever applied per-widget breakpoint overrides; page.components[].responsive is unaffected)",
+        "to": "dashboard widget key 'responsive' removed (#4876 — no renderer ever applied per-widget breakpoint overrides; the page.components[].responsive key this entry once deferred to was itself retired at protocol 18, #11027)",
         "conversionId": "dashboard-widget-responsive-removed",
         "toMajor": 17
       },
@@ -1350,7 +1350,7 @@
         },
         {
           "surface": "dashboard.widgets[].responsive",
-          "to": "dashboard widget key 'responsive' removed (#4876 — no renderer ever applied per-widget breakpoint overrides; page.components[].responsive is unaffected)",
+          "to": "dashboard widget key 'responsive' removed (#4876 — no renderer ever applied per-widget breakpoint overrides; the page.components[].responsive key this entry once deferred to was itself retired at protocol 18, #11027)",
           "conversionId": "dashboard-widget-responsive-removed",
           "toMajor": 17
         },
diff --git a/packages/spec/src/conversions/registry.ts b/packages/spec/src/conversions/registry.ts
index d6208afc08..21edf8944b 100644
--- a/packages/spec/src/conversions/registry.ts
+++ b/packages/spec/src/conversions/registry.ts
@@ -2508,15 +2508,17 @@ const dashboardInertKeysRemoved: MetadataConversion = {
  * author actually reads. Both are `toMajor: 17`, so a stored dashboard carrying
  * both keys is cleaned by both in one replay.
  *
- * Strips ONLY the widget embed. The shared `ResponsiveConfig` shape is
- * untouched and still live on `page.components[].responsive`.
+ * Strips ONLY the widget embed. At the time the shared `ResponsiveConfig`
+ * shape was believed to stay live on `page.components[].responsive`; #11027
+ * measured that carrier equally unread and retired it and the shape at
+ * protocol 18 (`page-component-responsive-removed` below).
  */
 const dashboardWidgetResponsiveRemoved: MetadataConversion = {
   id: 'dashboard-widget-responsive-removed',
   toMajor: 17,
   retiredFromLoadPath: true,
   surface: 'dashboard.widgets[].responsive',
-  summary: "dashboard widget key 'responsive' removed (#4876 — no renderer ever applied per-widget breakpoint overrides; page.components[].responsive is unaffected)",
+  summary: "dashboard widget key 'responsive' removed (#4876 — no renderer ever applied per-widget breakpoint overrides; the page.components[].responsive key this entry once deferred to was itself retired at protocol 18, #11027)",
   apply(stack, emit) {
     return mapCollection(stack, 'dashboards', (d, path) => {
       const widgets = d.widgets;
@@ -7803,6 +7805,102 @@ const mappingLookupParamsRemoved: MetadataConversion = {
   },
 };
 
+/**
+ * page.components[].responsive (#11027, ADR-0049 D2) — the LAST carrier of the
+ * `ResponsiveConfig` layout block, and the destination the
+ * `dashboard-widget-responsive-removed` tombstone (#4876) prescribed as the
+ * live alternative. Measured across objectstack + objectui (tsc-probe
+ * methodology, positive and negative controls): objectui's two implementations
+ * of the contract (`useResponsiveConfig`, `ResponsiveProtocol`) had zero
+ * callers, nothing read `.responsive` off a page component, and objectui's own
+ * node interface never declared the key — so the prescribed migration moved an
+ * inert key to an inert key. Zero authored instances exist in either repo, so
+ * this is expected to be a no-op on every real source; it exists so a stored
+ * page carrying the key is cleaned deterministically rather than meeting the
+ * tombstone at load. The shape (`ResponsiveConfigSchema` + its breakpoint
+ * maps + `BreakpointName`) leaves with the key — `RETIRED_DEFS_BY_MAJOR[18]`.
+ *
+ * Like its widget sibling it survived the earlier sweeps through an instrument
+ * gap, not on evidence: `page/regions` is an undrilled container
+ * (`undrilled-containers.baseline.json`), so no component-level key has ever
+ * been classified (#4956's page-side instance).
+ *
+ * The reach is every position a component can be authored in
+ * ({@link mapPageComponents}): `regions[].components[]`, `slots.<slot>`, and
+ * the containers a component nests under its `properties`.
+ */
+const pageComponentResponsiveRemoved: MetadataConversion = {
+  id: 'page-component-responsive-removed',
+  toMajor: 18,
+  retiredFromLoadPath: true,
+  surface: 'page.components[].responsive',
+  summary:
+    "page component key 'responsive' removed (#11027 — no renderer ever applied per-component "
+    + 'breakpoint layout overrides, and the shared ResponsiveConfig shape leaves with its last '
+    + 'carrier; use responsiveStyles (ADR-0065) for breakpoint behaviour that IS applied)',
+  apply(stack, emit) {
+    return mapPageComponents(stack, (component, path) =>
+      stripKeys(component, ['responsive'], emit, path));
+  },
+  fixture: {
+    before: {
+      pages: [{
+        name: 'ops_home',
+        regions: [{
+          name: 'main',
+          components: [
+            {
+              type: 'element:text',
+              id: 't1',
+              responsive: { columns: { xs: 12, lg: 4 }, order: { xs: 2, lg: 1 }, hiddenOn: ['xs'] },
+              // Control: the LIVE per-breakpoint channel is untouched.
+              responsiveStyles: { small: { padding: 'var(--space-4)' } },
+            },
+            // The nested position (#6775's lesson): a component inside a
+            // card's container is still a component.
+            {
+              type: 'page:card',
+              id: 'c1',
+              properties: {
+                children: [
+                  { type: 'element:divider', id: 'd1', responsive: { hiddenOn: ['xs'] } },
+                ],
+              },
+            },
+          ],
+        }],
+      }],
+    },
+    after: {
+      pages: [{
+        name: 'ops_home',
+        regions: [{
+          name: 'main',
+          components: [
+            {
+              type: 'element:text',
+              id: 't1',
+              responsiveStyles: { small: { padding: 'var(--space-4)' } },
+            },
+            {
+              type: 'page:card',
+              id: 'c1',
+              properties: {
+                children: [
+                  { type: 'element:divider', id: 'd1' },
+                ],
+              },
+            },
+          ],
+        }],
+      }],
+    },
+    // Two notices: one per stripped key site (the region-level component and
+    // the nested one).
+    expectedNotices: 2,
+  },
+};
+
 export const CONVERSIONS_BY_MAJOR: Readonly<Record<number, readonly MetadataConversion[]>> = {
   11: [flowNodeHttpRename, pageKindJsxToHtml, flowNodeFilterAlias, objectCompactLayoutRename],
   13: [stackRolesToPositions, owdLegacyReadAliases, sharingRecipientRoleToPosition],
@@ -7886,6 +7984,7 @@ export const CONVERSIONS_BY_MAJOR: Readonly<Record<number, readonly MetadataConv
     recordHighlightsFieldIconRemoved,
     mappingLookupParamsRemoved,
     translationComponentSubmitLabelRemoved,
+    pageComponentResponsiveRemoved,
   ],
 };
 
diff --git a/packages/spec/src/migrations/entries/retired-defs/18.ui__BreakpointColumnMap.ts b/packages/spec/src/migrations/entries/retired-defs/18.ui__BreakpointColumnMap.ts
new file mode 100644
index 0000000000..792cb71868
--- /dev/null
+++ b/packages/spec/src/migrations/entries/retired-defs/18.ui__BreakpointColumnMap.ts
@@ -0,0 +1,8 @@
+// Copyright (c) 2026 ObjectStack. Licensed under the Apache-2.0 license.
+
+// #11027 — `ui/BreakpointColumnMap` (breakpoint → grid column count, 1-12)
+// left with `ui/ResponsiveConfig`: its ONLY consumer was the retired
+// `ResponsiveConfigSchema.columns` (the #3950 rule — an exported value schema
+// with no consumer reads as a capability). See `18.ui__ResponsiveConfig.ts`
+// for the retirement record and the measurement.
+export const entry = 'ui/BreakpointColumnMap';
diff --git a/packages/spec/src/migrations/entries/retired-defs/18.ui__BreakpointName.ts b/packages/spec/src/migrations/entries/retired-defs/18.ui__BreakpointName.ts
new file mode 100644
index 0000000000..ac1730bea5
--- /dev/null
+++ b/packages/spec/src/migrations/entries/retired-defs/18.ui__BreakpointName.ts
@@ -0,0 +1,11 @@
+// Copyright (c) 2026 ObjectStack. Licensed under the Apache-2.0 license.
+
+// #11027 — `ui/BreakpointName` (the Tailwind-style `xs…2xl` breakpoint-name
+// enum) left with `ui/ResponsiveConfig`: its only consumers were the retired
+// `ResponsiveConfigSchema` (`breakpoint`, `hiddenOn`) and the two retired
+// breakpoint maps' key sets (the #3950 rule — an exported value schema with
+// no consumer reads as a capability). The surviving `ResponsiveStyles`
+// vocabulary is the ADR-0065 max-width buckets (`large`/`medium`/`small`/
+// `xsmall`), a different axis by design. See `18.ui__ResponsiveConfig.ts` for
+// the retirement record and the measurement.
+export const entry = 'ui/BreakpointName';
diff --git a/packages/spec/src/migrations/entries/retired-defs/18.ui__BreakpointOrderMap.ts b/packages/spec/src/migrations/entries/retired-defs/18.ui__BreakpointOrderMap.ts
new file mode 100644
index 0000000000..77884ddfb6
--- /dev/null
+++ b/packages/spec/src/migrations/entries/retired-defs/18.ui__BreakpointOrderMap.ts
@@ -0,0 +1,8 @@
+// Copyright (c) 2026 ObjectStack. Licensed under the Apache-2.0 license.
+
+// #11027 — `ui/BreakpointOrderMap` (breakpoint → display order) left with
+// `ui/ResponsiveConfig`: its ONLY consumer was the retired
+// `ResponsiveConfigSchema.order` (the #3950 rule — an exported value schema
+// with no consumer reads as a capability). See `18.ui__ResponsiveConfig.ts`
+// for the retirement record and the measurement.
+export const entry = 'ui/BreakpointOrderMap';
diff --git a/packages/spec/src/migrations/entries/retired-defs/18.ui__ResponsiveConfig.ts b/packages/spec/src/migrations/entries/retired-defs/18.ui__ResponsiveConfig.ts
new file mode 100644
index 0000000000..d7e6be520a
--- /dev/null
+++ b/packages/spec/src/migrations/entries/retired-defs/18.ui__ResponsiveConfig.ts
@@ -0,0 +1,14 @@
+// Copyright (c) 2026 ObjectStack. Licensed under the Apache-2.0 license.
+
+// #11027 — `ui/ResponsiveConfig` (the per-breakpoint LAYOUT block: grid
+// columns / visibility / display order on the Tailwind `xs…2xl` axis). Its
+// last authorable carrier, `page.components[].responsive`, is tombstoned in
+// this same major (ADR-0049 D2; the widget embed went in #4876, the view
+// embed in #3896), and an exported value schema with no consumer reads as a
+// capability (#3950 rule — the `PerformanceConfigSchema` precedent from the
+// very same file). Measured before removal: zero callers of either objectui
+// consumer implementation, zero authored instances in either repo. The live
+// per-breakpoint channel is `responsiveStyles` (ADR-0065, `ResponsiveStyles`),
+// which stays. The Tailwind-style layout vocabulary returns if and when a
+// renderer implements it — in one change, with the engine (the #4834 rule).
+export const entry = 'ui/ResponsiveConfig';
diff --git a/packages/spec/src/migrations/entries/retired-keys/18.ui__PageComponent__responsive.ts b/packages/spec/src/migrations/entries/retired-keys/18.ui__PageComponent__responsive.ts
new file mode 100644
index 0000000000..2c8f5587a6
--- /dev/null
+++ b/packages/spec/src/migrations/entries/retired-keys/18.ui__PageComponent__responsive.ts
@@ -0,0 +1,28 @@
+// Copyright (c) 2026 ObjectStack. Licensed under the Apache-2.0 license.
+
+// #11027 — ADR-0049 enforce-or-remove (maintainer ruling 2026-08-22, ruled B:
+// retire + repair the redirect texts in the same change). The LAST carrier of
+// the `ResponsiveConfig` layout block, and the destination the
+// `dashboard.widgets[].responsive` tombstone (#4876) prescribed as the live
+// alternative. Measured across objectstack + objectui with the tsc-probe
+// methodology (positive and negative controls): objectui's two implementations
+// of the contract (`useResponsiveConfig` in `@object-ui/mobile`,
+// `ResponsiveProtocol` in `@object-ui/core`) had ZERO callers, nothing read
+// `.responsive` off a page component, and objectui's own node interface never
+// declared the key — so an author following the shipped prescription moved an
+// inert key to an inert key and was told it now works. Same retirement the
+// family already took on identical evidence: `view.responsive` (#3896),
+// `dashboard.widgets[].responsive` (#4876). It survived the sweeps through an
+// instrument gap, not on evidence: `page/regions` is an undrilled container,
+// so no component-level key has ever been classified (#4956's page-side
+// instance). The shape leaves with its last carrier — see
+// `RETIRED_DEFS_BY_MAJOR[18]` (`ui/ResponsiveConfig` and its breakpoint maps).
+// The live per-breakpoint channel on the same component is `responsiveStyles`
+// (ADR-0065).
+//
+// Registered under 18, not 17: v17.0.0 was cut before this landed, so the
+// tombstone ships on the 17.x line (launch-window convention: accept-set
+// narrowings ride minor releases) and the prescription lives at the major
+// boundary where `migrate meta` users look (the #8495 / PR #8666 precedent).
+// Sources are rewritten by the D2 conversion `page-component-responsive-removed`.
+export const entry = 'ui/PageComponent:responsive';
diff --git a/packages/spec/src/migrations/registry.ts b/packages/spec/src/migrations/registry.ts
index 3daee72644..747764970f 100644
--- a/packages/spec/src/migrations/registry.ts
+++ b/packages/spec/src/migrations/registry.ts
@@ -922,11 +922,14 @@ const step17: MigrationStep = {
       'What kept it alive was not evidence but a hole in the instrument: the liveness ledger ',
       'declares no `children` on `dashboard.widgets`, and the walk only drills one level through ',
       'an explicit `children`, so no widget-level key has ever been classified at all (filed as ',
-      '#4956, fixed separately). The removal is deliberately narrow — it takes the widget EMBED, ',
-      'not the shape. `ResponsiveConfig` stays exported and stays live on ',
-      '`page.components[].responsive`, which objectui `useResponsiveConfig` genuinely reads, so ',
-      'no import breaks and authors who need breakpoint behaviour today have somewhere real to ',
-      'put it. Per-widget responsive layout returns if and when a renderer implements it.\n\n',
+      '#4956, fixed separately). The removal was deliberately narrow — it took the widget EMBED, ',
+      'not the shape, which at the time was believed live on `page.components[].responsive` via ',
+      'objectui `useResponsiveConfig`. CORRECTED at #11027 (2026-08): that belief measured false ',
+      '— the hook had zero callers, nothing read the page key either — so protocol 18 retires ',
+      '`page.components[].responsive` and the `ResponsiveConfig` shape with it (see the ',
+      '`page-component-responsive-removed` step-18 entry). Authors who need breakpoint behaviour ',
+      'use `responsiveStyles` (ADR-0065), the channel objectui really compiles. Per-widget ',
+      'responsive layout returns if and when a renderer implements it.\n\n',
       'Finally it CONVERGES `dashboard.widgets[].compareTo` (#5011) — the one entry in this step ',
       'that is not a removal but a vocabulary merge, and the one whose defect was worst-shaped. ',
       'The widget declared three arms with confident TSDoc; the analytics executor implements one ',
@@ -5155,7 +5158,21 @@ const step18: MigrationStep = {
     'authoring site; re-anchoring would have widened the face for one word. The ' +
     'mechanical conversion strips the key from stored bundles and items (pure lossless ' +
     'delete — nothing read it since #9249), at the acknowledged cost of dropping the ' +
-    'bespoke-component route for that one word.',
+    'bespoke-component route for that one word. ' +
+    'Finally, it retires `page.components[].responsive` and the whole `ResponsiveConfig` ' +
+    'layout vocabulary it carried (#11027, ADR-0049 D2; maintainer ruling 2026-08-22): the ' +
+    'key was the destination the `dashboard.widgets[].responsive` tombstone (#4876) ' +
+    'prescribed as the live alternative, and a two-repo measurement (tsc-probe methodology ' +
+    'with positive and negative controls) found the claim false — objectui\'s two ' +
+    'implementations of the contract (`useResponsiveConfig`, `ResponsiveProtocol`) had zero ' +
+    'callers and nothing read `.responsive` off a page component, so the prescribed ' +
+    'migration moved an inert key to an inert key while the platform\'s own error message ' +
+    'vouched for it. The same change repairs every shipped text that carried that redirect. ' +
+    '`ResponsiveConfigSchema`, its two breakpoint maps and the `BreakpointName` enum had no ' +
+    'other authorable carrier and leave with the key (RETIRED_DEFS_BY_MAJOR[18]); the live ' +
+    'per-breakpoint channel on a page component is `responsiveStyles` (ADR-0065), which ' +
+    'objectui really compiles. The mechanical conversion strips the key from stored pages ' +
+    '(pure lossless delete — it never had an effect to lose).',
   conversionIds: [
     'field-malformed-scale-precision-removed',
     'record-chatter-position-vocabulary',
@@ -5167,6 +5184,7 @@ const step18: MigrationStep = {
     'record-highlights-field-icon-removed',
     'mapping-lookup-params-removed',
     'translation-component-submit-label-removed',
+    'page-component-responsive-removed',
   ],
   semantic: [
     // One file per entry under `entries/semantic/`, concatenated here sorted by
@@ -6916,6 +6934,32 @@ export const RETIRED_KEYS_BY_MAJOR: Readonly<Record<number, readonly string[]>>
     // `element-input-target-variable-removed` (a page component IS a stack
     // collection member, unlike the `kernel/Manifest:loading` family).
     'ui/ElementTextInputProps:targetVariable',
+    // #11027 — ADR-0049 enforce-or-remove (maintainer ruling 2026-08-22, ruled B:
+    // retire + repair the redirect texts in the same change). The LAST carrier of
+    // the `ResponsiveConfig` layout block, and the destination the
+    // `dashboard.widgets[].responsive` tombstone (#4876) prescribed as the live
+    // alternative. Measured across objectstack + objectui with the tsc-probe
+    // methodology (positive and negative controls): objectui's two implementations
+    // of the contract (`useResponsiveConfig` in `@object-ui/mobile`,
+    // `ResponsiveProtocol` in `@object-ui/core`) had ZERO callers, nothing read
+    // `.responsive` off a page component, and objectui's own node interface never
+    // declared the key — so an author following the shipped prescription moved an
+    // inert key to an inert key and was told it now works. Same retirement the
+    // family already took on identical evidence: `view.responsive` (#3896),
+    // `dashboard.widgets[].responsive` (#4876). It survived the sweeps through an
+    // instrument gap, not on evidence: `page/regions` is an undrilled container,
+    // so no component-level key has ever been classified (#4956's page-side
+    // instance). The shape leaves with its last carrier — see
+    // `RETIRED_DEFS_BY_MAJOR[18]` (`ui/ResponsiveConfig` and its breakpoint maps).
+    // The live per-breakpoint channel on the same component is `responsiveStyles`
+    // (ADR-0065).
+    //
+    // Registered under 18, not 17: v17.0.0 was cut before this landed, so the
+    // tombstone ships on the 17.x line (launch-window convention: accept-set
+    // narrowings ride minor releases) and the prescription lives at the major
+    // boundary where `migrate meta` users look (the #8495 / PR #8666 precedent).
+    // Sources are rewritten by the D2 conversion `page-component-responsive-removed`.
+    'ui/PageComponent:responsive',
     // #10054 — ADR-0049 enforce-or-remove (maintainer ruling 2026-08-21, executing
     // the 2026-08-20 census verdict). `icon` on the object arm of
     // `RecordHighlightsField` was declared, described (`Icon name (lucide icon
@@ -7231,11 +7275,44 @@ export const RETIRED_DEFS_BY_MAJOR: Readonly<Record<number, readonly string[]>>
     // exported value schema with no consumer reads as a capability). See
     // `18.ui__Theme.ts` for the retirement record and the ruling.
     'ui/BorderRadius',
+    // #11027 — `ui/BreakpointColumnMap` (breakpoint → grid column count, 1-12)
+    // left with `ui/ResponsiveConfig`: its ONLY consumer was the retired
+    // `ResponsiveConfigSchema.columns` (the #3950 rule — an exported value schema
+    // with no consumer reads as a capability). See `18.ui__ResponsiveConfig.ts`
+    // for the retirement record and the measurement.
+    'ui/BreakpointColumnMap',
+    // #11027 — `ui/BreakpointName` (the Tailwind-style `xs…2xl` breakpoint-name
+    // enum) left with `ui/ResponsiveConfig`: its only consumers were the retired
+    // `ResponsiveConfigSchema` (`breakpoint`, `hiddenOn`) and the two retired
+    // breakpoint maps' key sets (the #3950 rule — an exported value schema with
+    // no consumer reads as a capability). The surviving `ResponsiveStyles`
+    // vocabulary is the ADR-0065 max-width buckets (`large`/`medium`/`small`/
+    // `xsmall`), a different axis by design. See `18.ui__ResponsiveConfig.ts` for
+    // the retirement record and the measurement.
+    'ui/BreakpointName',
+    // #11027 — `ui/BreakpointOrderMap` (breakpoint → display order) left with
+    // `ui/ResponsiveConfig`: its ONLY consumer was the retired
+    // `ResponsiveConfigSchema.order` (the #3950 rule — an exported value schema
+    // with no consumer reads as a capability). See `18.ui__ResponsiveConfig.ts`
+    // for the retirement record and the measurement.
+    'ui/BreakpointOrderMap',
     // #10485 — `ui/ColorPalette` (the colour palette sub-block) left with `ui/Theme`:
     // its ONLY consumer was the retired `ThemeSchema` (the #3950 rule — an
     // exported value schema with no consumer reads as a capability). See
     // `18.ui__Theme.ts` for the retirement record and the ruling.
     'ui/ColorPalette',
+    // #11027 — `ui/ResponsiveConfig` (the per-breakpoint LAYOUT block: grid
+    // columns / visibility / display order on the Tailwind `xs…2xl` axis). Its
+    // last authorable carrier, `page.components[].responsive`, is tombstoned in
+    // this same major (ADR-0049 D2; the widget embed went in #4876, the view
+    // embed in #3896), and an exported value schema with no consumer reads as a
+    // capability (#3950 rule — the `PerformanceConfigSchema` precedent from the
+    // very same file). Measured before removal: zero callers of either objectui
+    // consumer implementation, zero authored instances in either repo. The live
+    // per-breakpoint channel is `responsiveStyles` (ADR-0065, `ResponsiveStyles`),
+    // which stays. The Tailwind-style layout vocabulary returns if and when a
+    // renderer implements it — in one change, with the engine (the #4834 rule).
+    'ui/ResponsiveConfig',
     // #10485 — `ui/Shadow` (the shadow scale sub-block) left with `ui/Theme`:
     // its ONLY consumer was the retired `ThemeSchema` (the #3950 rule — an
     // exported value schema with no consumer reads as a capability). See
diff --git a/packages/spec/src/type-alias-convention.pin.test.ts b/packages/spec/src/type-alias-convention.pin.test.ts
index 06a3c017cd..a4564cc7f4 100644
--- a/packages/spec/src/type-alias-convention.pin.test.ts
+++ b/packages/spec/src/type-alias-convention.pin.test.ts
@@ -267,7 +267,7 @@ import type * as M170 from './ui/component.zod.js';
 import type * as M183 from './api/sortability.zod.js';
 
 // ---------------------------------------------------------------------------
-// 837 isomorphic aliases: `z.input` === `z.infer`, so no `XParsed` is declared.
+// 833 isomorphic aliases: `z.input` === `z.infer`, so no `XParsed` is declared.
 //
 // That number is machine-checked, not hand-kept. The runtime companion at the
 // bottom of this file recomputes the pin count from the source and asserts that
@@ -1337,8 +1337,9 @@ export type Iso694 = Assert<Eq< z.input< typeof M163.ElementDataSourceSchema >,
 export type Iso695 = Assert<Eq< z.input< typeof M164.JoinedReportBlockSchema >, z.infer< typeof M164.JoinedReportBlockSchema > >>;
 
 // ui/responsive.zod.ts
-export type Iso696 = Assert<Eq< z.input< typeof M165.BreakpointName >, z.infer< typeof M165.BreakpointName > >>;
-export type Iso697 = Assert<Eq< z.input< typeof M165.ResponsiveConfigSchema >, z.infer< typeof M165.ResponsiveConfigSchema > >>;
+// (Iso696 `BreakpointName` / Iso697 `ResponsiveConfigSchema` removed with
+// their schemas — #11027's ADR-0049 retirement of the responsive layout
+// vocabulary. The Iso numbers are positional and stay vacant.)
 export type Iso698 = Assert<Eq< z.input< typeof M165.StyleMapSchema >, z.infer< typeof M165.StyleMapSchema > >>;
 export type Iso699 = Assert<Eq< z.input< typeof M165.ResponsiveStylesSchema >, z.infer< typeof M165.ResponsiveStylesSchema > >>;
 
@@ -1581,8 +1582,8 @@ export type Iso822 = Assert<Eq< z.input< typeof M163.PageComponentType >, z.infe
 export type Iso823 = Assert<Eq< z.input< typeof M164.ReportType >, z.infer< typeof M164.ReportType > >>;
 
 // ui/responsive.zod.ts
-export type Iso824 = Assert<Eq< z.input< typeof M165.BreakpointColumnMapSchema >, z.infer< typeof M165.BreakpointColumnMapSchema > >>;
-export type Iso825 = Assert<Eq< z.input< typeof M165.BreakpointOrderMapSchema >, z.infer< typeof M165.BreakpointOrderMapSchema > >>;
+// (Iso824 `BreakpointColumnMapSchema` / Iso825 `BreakpointOrderMapSchema`
+// removed with their schemas — #11027, see the Iso696/Iso697 note above.)
 
 // ui/view.zod.ts
 export type Iso826 = Assert<Eq< z.input< typeof M167.CalendarConfigSchema >, z.infer< typeof M167.CalendarConfigSchema > >>;
@@ -1667,7 +1668,7 @@ describe('ADR-0122 type-alias convention', () => {
   // this title and the section header above the pin list — are now asserted
   // against the recomputed count below, so neither can go stale without a red
   // test naming it.
-  it('still declares all 837 isomorphic pins', () => {
+  it('still declares all 833 isomorphic pins', () => {
     // The truth of each pin is proved by tsc, not here — an `Assert<Eq<...>>`
     // that stops holding is a compile error with the alias named. What tsc
     // cannot notice is a pin that was DELETED: removing the assertion removes
@@ -1950,9 +1951,15 @@ describe('ADR-0122 type-alias convention', () => {
     // coincide and ADR-0122 gives it a pin rather than an `XParsed`. Its id is
     // `Iso856`, the next free one — the ids are claims about pins, not
     // positions.
+    //
+    // 837 -> 833 is #11027's ADR-0049 retirement of the responsive layout
+    // vocabulary (`BreakpointName`, `ResponsiveConfigSchema`,
+    // `BreakpointColumnMapSchema`, `BreakpointOrderMapSchema` — Iso696/697/
+    // 824/825): the four schemas no longer exist, so there is nothing left to
+    // exempt. -4 retired, +0 of my own; the Iso numbers stay vacant.
     const self = readFileSync(fileURLToPath(import.meta.url), 'utf8');
     const pins = self.match(/^export type Iso\d+ = Assert</gm) ?? [];
-    expect(pins).toHaveLength(837);
+    expect(pins).toHaveLength(833);
 
     // The count is stated in PROSE twice as well — this case's title and the
     // section header above the pin list — and until #6605 nothing read either
diff --git a/packages/spec/src/ui/dashboard.test.ts b/packages/spec/src/ui/dashboard.test.ts
index c152bea684..1f5bec2575 100644
--- a/packages/spec/src/ui/dashboard.test.ts
+++ b/packages/spec/src/ui/dashboard.test.ts
@@ -546,9 +546,14 @@ describe('[#4876] DashboardWidgetSchema — retired `responsive`', () => {
     expect(message).toMatch(/removed in @objectstack\/spec 17\.0\.0/);
     expect(message).toMatch(/#4876/);
     expect(message).toMatch(/Delete the key/);
-    // It must point at the surviving home for the capability, or an author who
-    // really wants breakpoints reads this as "responsive layout is gone".
-    expect(message).toMatch(/page\.components\[\]\.responsive/);
+    // The redirect correction (#11027): this message used to prescribe
+    // `page.components[].responsive` as the live home of the shared shape;
+    // that key measured equally unread and is retired too, so the message
+    // must (a) say so rather than silently dropping the old promise — an
+    // author who followed it needs the correction — and (b) point at the
+    // channel that IS applied.
+    expect(message).toMatch(/page\.components\[\]\.responsive[\s\S]*#11027/);
+    expect(message).toMatch(/responsiveStyles/);
     // `.strict()` on this schema would answer a DELETED key with a generic
     // unrecognized-key error. The tombstone is what makes it a prescription —
     // if this ever regresses to the strict path, this assertion is the tripwire.
@@ -561,26 +566,22 @@ describe('[#4876] DashboardWidgetSchema — retired `responsive`', () => {
     expect(w.dataset).toBe('orders');
   });
 
-  // ── CONTROL: the shared shape is NOT retired, only this embed ──────────────
-  it('CONTROL: `ResponsiveConfigSchema` is still exported and still parses', async () => {
-    const ui = await import('./index');
-    expect(ui.ResponsiveConfigSchema).toBeTruthy();
-    const cfg = ui.ResponsiveConfigSchema.parse({
-      columns: { xs: 12, lg: 4 }, order: { xs: 2, lg: 1 }, hiddenOn: ['xs'],
-    });
-    expect(cfg.columns).toEqual({ xs: 12, lg: 4 });
-    expect(cfg.hiddenOn).toEqual(['xs']);
-  });
-
-  it('CONTROL: `page.components[].responsive` parses exactly as before', async () => {
+  // ── The former CONTROLs, inverted by #11027 ────────────────────────────────
+  // Until #11027 two controls here asserted that `ResponsiveConfigSchema`
+  // stayed exported and that `page.components[].responsive` round-tripped —
+  // the "only this embed goes" contract of #4876. The #11027 measurement
+  // falsified the premise those controls encoded (nothing ever read the page
+  // key either), so the shape left with its last carrier and the page key is
+  // a tombstone of its own, pinned in `page.test.ts`
+  // ("[#11027] PageComponentSchema — retired `responsive`"). The surviving
+  // control is the channel the corrected prescriptions point at:
+  it('CONTROL: `responsiveStyles` on a page component still parses (ADR-0065)', async () => {
     const { PageComponentSchema } = await import('./page.zod');
     const c = PageComponentSchema.parse({
       type: 'page:sidebar', properties: {},
-      responsive: { columns: { xs: 12, lg: 4 }, order: { xs: 2, lg: 1 }, hiddenOn: ['xs'] },
+      responsiveStyles: { small: { display: 'none' } },
     });
-    // Round-trips untouched — the page embed is a live consumer path
-    // (objectui `useResponsiveConfig`), not a second casualty of this removal.
-    expect(c.responsive).toEqual({ columns: { xs: 12, lg: 4 }, order: { xs: 2, lg: 1 }, hiddenOn: ['xs'] });
+    expect(c.responsiveStyles).toEqual({ small: { display: 'none' } });
   });
 });
 
diff --git a/packages/spec/src/ui/dashboard.zod.ts b/packages/spec/src/ui/dashboard.zod.ts
index 61200e21b9..36edf17211 100644
--- a/packages/spec/src/ui/dashboard.zod.ts
+++ b/packages/spec/src/ui/dashboard.zod.ts
@@ -20,9 +20,10 @@ import { SnakeCaseIdentifierSchema } from '../shared/identifiers.zod';
 // tombstone below.
 import { I18nLabelSchema } from './i18n.zod';
 // `ResponsiveConfigSchema` is no longer imported here: `widgets[].responsive`
-// was retired (#4876). The shape itself is NOT removed — it stays live on
-// `page.components[].responsive` (`page.zod.ts`), whose renderer really does
-// read it (objectui `useResponsiveConfig`). See the tombstone below.
+// was retired (#4876). At the time the shape survived on
+// `page.components[].responsive`; #11027 then measured THAT carrier dead too
+// (zero callers of either objectui implementation) and retired the key and the
+// shape whole. See the tombstone below.
 
 /**
  * Color variant for dashboard widgets (e.g., KPI cards).
@@ -585,21 +586,28 @@ export const DashboardWidgetSchema = lazySchema(() => strictObject({
   // `responsive` REMOVED (#4876): authorable and inert, exactly like the
   // same-named `view.responsive` retired four days earlier (#3896 close-out).
   // No objectui code read `widget.responsive` — DashboardRenderer /
-  // DashboardEditor / plugin-designer mention it only in comments, and the one
-  // real per-breakpoint consumer (`useResponsiveConfig`) is fed by
-  // `page.components[].responsive`, not by a widget. It escaped the #3896 sweep
-  // through a liveness-ledger drill gap, not on evidence: `dashboard.json`
-  // declares no `children` on `widgets`, so no widget-level key has ever been
-  // classified (#4956). The shared `ResponsiveConfigSchema` survives untouched
-  // via `page.zod.ts` — only this embed goes.
+  // DashboardEditor / plugin-designer mention it only in comments. It escaped
+  // the #3896 sweep through a liveness-ledger drill gap, not on evidence:
+  // `dashboard.json` declared no `children` on `widgets`, so no widget-level
+  // key had ever been classified (#4956).
+  //
+  // CORRECTED (#11027): this tombstone used to redirect authors to
+  // `page.components[].responsive` as the live home of the shared
+  // `ResponsiveConfig` shape, on the belief that objectui `useResponsiveConfig`
+  // read it. Measured 2026-08 across both repos, that hook (and the second
+  // implementation, `ResponsiveProtocol`) had ZERO callers — the prescribed
+  // destination applied no breakpoint behaviour either. The page key and the
+  // shape are retired too (`page.zod.ts` tombstone, ADR-0049 D2); the live
+  // per-breakpoint channel is `responsiveStyles` (ADR-0065).
   responsive: retiredKey(
     '`dashboard.widgets[].responsive` was removed in @objectstack/spec 17.0.0 (#4876, ADR-0049 D2) — ' +
     'no renderer ever read it, so per-widget breakpoint overrides were never applied: the value ' +
     'parsed, validated, and then did nothing. The dashboard grid reflows by its own layout rules ' +
     '(`columns` + `gap` on the dashboard, the `layout` box on each widget). Delete the key. ' +
-    'The shared `ResponsiveConfig` shape is NOT gone — it stays live on `page.components[].responsive`, ' +
-    'which objectui `useResponsiveConfig` really does read; move the layout there if you need ' +
-    'breakpoint behaviour today. ' +
+    'This message used to point at `page.components[].responsive` as the live home of the shared ' +
+    '`ResponsiveConfig` shape; that key was measured equally unread and removed with the shape ' +
+    'in #11027. For breakpoint behaviour that IS applied, use `responsiveStyles` on a page ' +
+    'component (ADR-0065) — per-breakpoint CSS maps compiled to id-scoped CSS at render. ' +
     'Run `os migrate meta --from 16` to list the mechanical edits for existing sources; apply them by hand.',
   ),
 
diff --git a/packages/spec/src/ui/interaction-config-retirement.test.ts b/packages/spec/src/ui/interaction-config-retirement.test.ts
index 47ac6defe2..e68cce7792 100644
--- a/packages/spec/src/ui/interaction-config-retirement.test.ts
+++ b/packages/spec/src/ui/interaction-config-retirement.test.ts
@@ -104,8 +104,10 @@ describe('[#4988] ui/ interaction config family retirement', () => {
    * Names that must SURVIVE on `./ui`, one per neighbouring concern a
    * too-wide sweep would plausibly take:
    *
-   * - `ResponsiveConfigSchema` — batch 13's sixth file, measured REACHABLE and
-   *   tightened instead of retired. The single most likely over-deletion.
+   * - (`ResponsiveConfigSchema` stood here — batch 13's sixth file, measured
+   *   graph-REACHABLE and tightened — until #11027 measured its consumers dead
+   *   and retired the shape with its last carrier, ADR-0049. A survivor list
+   *   entry follows its subject out.)
    * - `AriaPropsSchema` / `I18nLabelSchema` — the two shapes the five retired
    *   modules imported; deleting a consumer must not take its dependency.
    * - `NotificationTypeSchema` — `ui/notification.zod.ts` kept its presentation
@@ -117,7 +119,6 @@ describe('[#4988] ui/ interaction config family retirement', () => {
    *   vocabularies would have hung off had they ever had a carrier.
    */
   const MUST_SURVIVE = [
-    'ResponsiveConfigSchema',
     'AriaPropsSchema',
     'I18nLabelSchema',
     'NotificationTypeSchema',
diff --git a/packages/spec/src/ui/page.test.ts b/packages/spec/src/ui/page.test.ts
index da30315a49..911a8eece0 100644
--- a/packages/spec/src/ui/page.test.ts
+++ b/packages/spec/src/ui/page.test.ts
@@ -445,14 +445,53 @@ describe('Page ARIA Integration', () => {
   });
 });
 
-describe('Page Responsive Integration', () => {
-  it('should accept component with responsive config', () => {
-    const result = PageComponentSchema.parse({
+// ---------------------------------------------------------------------------
+// [#11027] `page.components[].responsive` is RETIRED (ADR-0049 D2)
+//
+// RUNTIME assertions, the dashboard.test.ts #4876 pattern: the tombstone's
+// `tsc` channel is proved by the build of the packages that author pages, not
+// by this file. This key was the destination the #4876 widget tombstone
+// prescribed as live; measured 2026-08, neither objectui consumer
+// implementation had a single caller, so the whole `ResponsiveConfig` layout
+// vocabulary left with its last carrier.
+// ---------------------------------------------------------------------------
+describe('[#11027] PageComponentSchema — retired `responsive`', () => {
+  it('REJECTS an authored `responsive` with the prescription (not "unrecognized key")', () => {
+    let message = '';
+    try {
+      PageComponentSchema.parse({
+        type: 'page:sidebar',
+        properties: {},
+        responsive: { hiddenOn: ['xs', 'sm'] },
+      });
+    } catch (e) { message = String((e as Error).message); }
+
+    // The prescription in the four parts an upgrading author needs: the
+    // fully-qualified key, the version, the issue, and the fix.
+    expect(message).toMatch(/page\.components\[\]\.responsive/);
+    expect(message).toMatch(/removed in @objectstack\/spec 17/);
+    expect(message).toMatch(/#11027/);
+    expect(message).toMatch(/Delete the key/);
+    // It must point at the per-breakpoint channel that IS applied, or an
+    // author who really wants breakpoints reads this as "responsive is gone".
+    expect(message).toMatch(/responsiveStyles/);
+    // The house migrate sentence, spanning lines (`s` flag).
+    expect(message).toMatch(/os migrate meta --from 17/s);
+    // `.strict()` on this schema would answer a DELETED key with a generic
+    // unrecognized-key error. The tombstone is what makes it a prescription.
+    expect(message).not.toMatch(/Unrecognized key/);
+  });
+
+  it('still accepts a component with no `responsive` (the retirement strips nothing else)', () => {
+    const c = PageComponentSchema.parse({
       type: 'page:sidebar',
       properties: {},
-      responsive: { hiddenOn: ['xs', 'sm'] },
+      responsiveStyles: { xsmall: { display: 'none' } },
     });
-    expect(result.responsive?.hiddenOn).toEqual(['xs', 'sm']);
+    expect(c).not.toHaveProperty('responsive');
+    // CONTROL: the LIVE per-breakpoint channel on the same component (ADR-0065)
+    // is not a second casualty of this removal.
+    expect(c.responsiveStyles?.xsmall?.display).toBe('none');
   });
 });
 
diff --git a/packages/spec/src/ui/page.zod.ts b/packages/spec/src/ui/page.zod.ts
index 0adac316af..8f4e9da3c6 100644
--- a/packages/spec/src/ui/page.zod.ts
+++ b/packages/spec/src/ui/page.zod.ts
@@ -8,7 +8,8 @@ import { VISIBILITY_ONLY_STRICT_OPTIONS } from '../shared/editability-boundary';
 import { SortItemSchema } from '../shared/enums.zod';
 import { FilterConditionSchema } from '../data/filter.zod';
 import { I18nLabelSchema, AriaPropsSchema } from './i18n.zod';
-import { ResponsiveConfigSchema, ResponsiveStylesSchema } from './responsive.zod';
+import { ResponsiveStylesSchema } from './responsive.zod';
+import { retiredKey } from '../shared/retired-key';
 import {
   UserActionsConfigSchema,
   AppearanceConfigSchema,
@@ -234,8 +235,32 @@ export const PageComponentSchema = lazySchema(() => strictObject({
   /** Per-element data binding, overrides page-level object context */
   dataSource: ElementDataSourceSchema.optional().describe('Per-element data binding for multi-object pages'),
 
-  /** Responsive layout overrides per breakpoint */
-  responsive: ResponsiveConfigSchema.optional().describe('Responsive layout configuration'),
+  // `responsive` REMOVED (#11027, ADR-0049 D2): authorable and inert, exactly
+  // like `view.responsive` (#3896) and `dashboard.widgets[].responsive`
+  // (#4876) before it — and it was the key the #4876 tombstone redirected
+  // authors TO. Measured across objectstack + objectui (tsc-probe methodology
+  // with positive and negative controls): objectui's two implementations of
+  // the contract (`useResponsiveConfig`, `ResponsiveProtocol`) had zero
+  // callers, nothing read `.responsive` off a page component, and objectui's
+  // own node interface never declared the key — so the "live destination" the
+  // family's tombstones prescribed applied no breakpoint behaviour at all.
+  // It escaped classification through the same instrument gap as the widget
+  // key (#4956's page-side instance): `page/regions` is an undrilled
+  // container, so no component-level key has ever been asked. The live
+  // per-breakpoint channel on this same component is `responsiveStyles`
+  // (ADR-0065, sixteen lines up), which objectui really does compile.
+  // `ResponsiveConfigSchema` and its breakpoint maps had no other authorable
+  // carrier and are removed with the key (`responsive.zod.ts`, the
+  // PerformanceConfigSchema precedent).
+  responsive: retiredKey(
+    '`page.components[].responsive` was removed in @objectstack/spec 17 (#11027, ADR-0049 D2) — ' +
+    'no renderer ever read it, so per-breakpoint layout overrides (columns/order/visibility) ' +
+    'parsed, validated, and then did nothing. Delete the key. For breakpoint behaviour that IS ' +
+    'applied, use the sibling `responsiveStyles` (ADR-0065) — per-breakpoint CSS maps compiled ' +
+    "to id-scoped CSS at render, e.g. `responsiveStyles: { xsmall: { display: 'none' } }` to " +
+    'hide a component on the narrowest screens. ' +
+    'Run `os migrate meta --from 17` to list the mechanical edits for existing sources; apply them by hand.',
+  ),
 
   /** ARIA accessibility attributes */
   aria: AriaPropsSchema.optional().describe('ARIA accessibility attributes'),
diff --git a/packages/spec/src/ui/responsive.test.ts b/packages/spec/src/ui/responsive.test.ts
index 772163dbfd..4576e95a51 100644
--- a/packages/spec/src/ui/responsive.test.ts
+++ b/packages/spec/src/ui/responsive.test.ts
@@ -1,110 +1,26 @@
 import { describe, it, expect } from 'vitest';
 import {
-  ResponsiveConfigSchema,
   ResponsiveStylesSchema,
   StyleMapSchema,
-  BreakpointColumnMapSchema,
-  BreakpointOrderMapSchema,
-  BreakpointName,
-  type ResponsiveConfig,
 } from './responsive.zod';
 import { PageComponentSchema } from './page.zod';
 
-describe('BreakpointName', () => {
-  it('should accept all valid breakpoint names', () => {
-    const names = ['xs', 'sm', 'md', 'lg', 'xl', '2xl'] as const;
-
-    names.forEach(name => {
-      expect(() => BreakpointName.parse(name)).not.toThrow();
-    });
-  });
-
-  it('should reject invalid breakpoint names', () => {
-    expect(() => BreakpointName.parse('xxl')).toThrow();
-    expect(() => BreakpointName.parse('mobile')).toThrow();
-    expect(() => BreakpointName.parse('')).toThrow();
-  });
-});
-
-describe('ResponsiveConfigSchema', () => {
-  it('should accept empty config', () => {
-    expect(() => ResponsiveConfigSchema.parse({})).not.toThrow();
-  });
-
-  it('should accept config with breakpoint visibility', () => {
-    const config: ResponsiveConfig = {
-      breakpoint: 'md',
-    };
-
-    const result = ResponsiveConfigSchema.parse(config);
-    expect(result.breakpoint).toBe('md');
-  });
-
-  it('should accept config with hiddenOn breakpoints', () => {
-    const config: ResponsiveConfig = {
-      hiddenOn: ['xs', 'sm'],
-    };
-
-    const result = ResponsiveConfigSchema.parse(config);
-    expect(result.hiddenOn).toEqual(['xs', 'sm']);
-  });
-
-  it('should accept config with column mapping', () => {
-    const config: ResponsiveConfig = {
-      columns: { xs: 12, sm: 6, md: 4, lg: 3 },
-    };
-
-    const result = ResponsiveConfigSchema.parse(config);
-    expect(result.columns?.xs).toBe(12);
-    expect(result.columns?.lg).toBe(3);
-  });
-
-  it('should reject columns outside 1-12 range', () => {
-    expect(() => ResponsiveConfigSchema.parse({
-      columns: { xs: 0 },
-    })).toThrow();
-
-    expect(() => ResponsiveConfigSchema.parse({
-      columns: { xs: 13 },
-    })).toThrow();
-  });
-
-  it('should accept config with display order', () => {
-    const config: ResponsiveConfig = {
-      order: { xs: 2, lg: 1 },
-    };
-
-    const result = ResponsiveConfigSchema.parse(config);
-    expect(result.order?.xs).toBe(2);
-    expect(result.order?.lg).toBe(1);
-  });
-
-  it('should accept full responsive config', () => {
-    const config: ResponsiveConfig = {
-      breakpoint: 'sm',
-      hiddenOn: ['xs'],
-      columns: { xs: 12, sm: 6, md: 4, lg: 3, xl: 2 },
-      order: { xs: 3, lg: 1 },
-    };
-
-    expect(() => ResponsiveConfigSchema.parse(config)).not.toThrow();
-  });
-});
-
-// PerformanceConfigSchema tests removed with the schema (#3896 close-out):
-// every carrier of a `performance` block was authorable and inert.
-//
-// The `type PerformanceConfig` import that survived beside them until #4001
-// batch 13 did not: it named an export removed with the schema, so this file
-// had been importing a type that does not exist. It compiled only because
-// nothing here used it.
+// BreakpointName / ResponsiveConfigSchema / BreakpointColumnMapSchema /
+// BreakpointOrderMapSchema tests removed with the schemas (#11027, ADR-0049
+// D2): every authorable carrier of the `responsive` layout block was inert —
+// `view.responsive` (#3896), `dashboard.widgets[].responsive` (#4876), and
+// finally `page.components[].responsive`, whose two objectui consumer
+// implementations had zero callers. The retirement pins live in
+// `page.test.ts` ("[#11027] PageComponentSchema — retired `responsive`");
+// the #4001 批 13 curation measurements those suites kept executable are
+// preserved on the surviving shape below where they still have a subject.
 
 // ---------------------------------------------------------------------------
-// #4001 batch 13 (ADR-0078). This file carries TWO breakpoint vocabularies and
-// they sit sixteen lines apart on the same page component — `responsiveStyles`
-// (large/medium/small/xsmall, ADR-0065) and `responsive` (columns/order keyed
-// xs…2xl). Crossing them is the mistake this file invites, and until now every
-// crossing was silent.
+// #4001 batch 13 (ADR-0078). This file used to carry TWO breakpoint
+// vocabularies sixteen lines apart on the same page component; since #11027
+// only `responsiveStyles` (large/medium/small/xsmall, ADR-0065) survives, and
+// the curation's job is to catch the vocabularies authors still carry in —
+// the Tailwind ramp, and the knobs of the retired `responsive` block.
 // ---------------------------------------------------------------------------
 describe('unknown keys are rejected, not stripped (#4001 batch 13)', () => {
   const unknownKeyIssue = (schema: { safeParse: (v: unknown) => any }, value: unknown) => {
@@ -120,9 +36,10 @@ describe('unknown keys are rejected, not stripped (#4001 batch 13)', () => {
     });
 
     it('maps the Tailwind ramp onto the max-width bucket that contains it', () => {
-      // The sibling vocabulary: `BreakpointName`, declared in this same file and
-      // used by `responsive` on the same component. Edit distance cannot get
-      // from `lg` to `large`, so only a written-down alias answers it.
+      // The vocabulary the retired sibling `responsive` block was keyed by
+      // (#11027), and the one authors carry in from Tailwind itself. Edit
+      // distance cannot get from `lg` to `large`, so only a written-down
+      // alias answers it.
       const cases: Array<[string, string]> = [
         ['xs', 'xsmall'], ['sm', 'small'], ['md', 'medium'],
         ['lg', 'large'], ['xl', 'large'], ['2xl', 'large'],
@@ -135,11 +52,15 @@ describe('unknown keys are rejected, not stripped (#4001 batch 13)', () => {
       }
     });
 
-    it('points a `responsive` key at the sibling key, not at a bucket', () => {
+    it('answers a retired `responsive` knob with its CSS translation', () => {
+      // `columns` / `hiddenOn` / `order` were the knobs of the retired layout
+      // block (#11027). An author who lands one here is migrating off it, so
+      // each entry names the removal and the CSS that IS applied.
       for (const key of ['columns', 'hiddenOn', 'order']) {
         const message = unknownKeyIssue(ResponsiveStylesSchema, { [key]: {} })!.message;
-        expect(message, `\`${key}\` should be sent one level out`).toContain('sibling key');
-        expect(message).toContain('`responsive:');
+        expect(message, `\`${key}\` should name the retirement`).toContain('retired `responsive` layout block');
+        expect(message).toContain('#11027');
+        expect(message).toContain('per-breakpoint CSS');
       }
     });
 
@@ -155,94 +76,7 @@ describe('unknown keys are rejected, not stripped (#4001 batch 13)', () => {
     });
   });
 
-  describe('ResponsiveConfigSchema', () => {
-    it('rejects an undeclared key instead of dropping it', () => {
-      expect(unknownKeyIssue(ResponsiveConfigSchema, { colums: { lg: 4 } })!.message)
-        .toContain('`colums` → `columns`');
-    });
-
-    it('answers a bare breakpoint name with the knob-first shape', () => {
-      // The legacy breakpoint-keyed form. Not hypothetical: it is the `before`
-      // fixture of the `view-inert-keys-removed` conversion, from the
-      // `view.responsive` retired in 17 (#3896).
-      const message = unknownKeyIssue(ResponsiveConfigSchema, { sm: {} })!.message;
-      expect(message).toContain('BREAKPOINT NAME');
-      expect(message).toContain("columns: { sm: 6 }");
-    });
-
-    it('names each offending breakpoint separately, not once for all of them', () => {
-      // `guidance` emits one bullet VERBATIM per key, so a shared prescription
-      // string prints the same paragraph N times (the batch 10 `join` /
-      // `joinGateway` lesson). Each name carries its own text instead.
-      const message = unknownKeyIssue(ResponsiveConfigSchema, { sm: {}, lg: {} })!.message;
-      expect(message).toContain("columns: { sm: 6 }");
-      expect(message).toContain("columns: { lg: 6 }");
-    });
-
-    it('sends a `responsiveStyles` bucket back to the sibling key', () => {
-      for (const bucket of ['large', 'medium', 'small', 'xsmall']) {
-        expect(unknownKeyIssue(ResponsiveConfigSchema, { [bucket]: {} })!.message)
-          .toContain('`responsiveStyles`');
-      }
-      expect(unknownKeyIssue(ResponsiveConfigSchema, { responsiveStyles: {} })!.message)
-        .toContain('one level');
-    });
-
-    it('reaches `hiddenOn` from both wrong spellings', () => {
-      // `hidden` is objectui's RESOLVED spelling (`useResponsiveConfig` returns
-      // `{ hidden, columns, order, breakpoint }`) — a different WORD, which no
-      // edit distance can reach, so it keeps its entry in the alias table.
-      expect(unknownKeyIssue(ResponsiveConfigSchema, { hidden: true })!.message)
-        .toContain('`hidden` → `hiddenOn`');
-      // `hideOn` is the SAME word and had an alias entry of its own until #4990,
-      // because the fallback charged the author for `hiddenOn`'s capital O:
-      // `hideOn` scored 3 against a budget of 2 and returned nothing, while the
-      // all-lowercase `hiddenon` scored 1 and resolved. #4990 folds case on both
-      // sides, so the alias was retired and this now rides the fallback alone.
-      // These two assertions ARE batch 13's measurement, kept executable — the
-      // first fails if the general fix regresses, the second is the comparison
-      // that made the old behaviour indefensible.
-      expect(unknownKeyIssue(ResponsiveConfigSchema, { hideOn: ['xs'] })!.message)
-        .toContain('`hideOn` → `hiddenOn`');
-      expect(unknownKeyIssue(ResponsiveConfigSchema, { hiddenon: ['xs'] })!.message)
-        .toContain('`hiddenon` → `hiddenOn`');
-    });
-  });
-
-  describe('the per-breakpoint maps', () => {
-    it('maps the styling vocabulary back onto the Tailwind ramp', () => {
-      for (const schema of [BreakpointColumnMapSchema, BreakpointOrderMapSchema]) {
-        for (const [wrote, meant] of [['large', 'lg'], ['medium', 'md'], ['small', 'sm'], ['xsmall', 'xs']]) {
-          expect(unknownKeyIssue(schema, { [wrote]: 4 })!.message)
-            .toContain(`\`${wrote}\` → \`${meant}\``);
-        }
-      }
-    });
-
-    it('answers the recorded `xxl` near-miss with `2xl`', () => {
-      // Pinned as an invalid breakpoint name by this file's own test since
-      // before #4001 ("should reject invalid breakpoint names", above).
-      expect(unknownKeyIssue(BreakpointColumnMapSchema, { xxl: 4 })!.message)
-        .toContain('`xxl` → `2xl`');
-    });
-
-    it('was the worst of the three, because half the map survived', () => {
-      // Measured on `main` before this change:
-      //   ResponsiveConfigSchema.parse({ columns: { large: 4, lg: 3 } })
-      //     → { columns: { lg: 3 } }
-      // The node did lay out — at the wrong width, on the breakpoints the
-      // author never named. A total loss is at least visible.
-      const result = ResponsiveConfigSchema.safeParse({ columns: { large: 4, lg: 3 } });
-      expect(result.success).toBe(false);
-    });
-
-    it('still accepts every declared breakpoint, including the quoted one', () => {
-      expect(BreakpointColumnMapSchema.parse({ xs: 12, sm: 6, md: 4, lg: 3, xl: 2, '2xl': 1 })['2xl']).toBe(1);
-      expect(BreakpointOrderMapSchema.parse({ xs: 3, '2xl': 1 })['2xl']).toBe(1);
-    });
-  });
-
-  // THE SEAM THIS CHANGE EXISTS FOR. `PageComponentSchema` has been `.strict()`
+  // THE SEAM #4001 批 13 EXISTED FOR. `PageComponentSchema` has been `.strict()`
   // since ADR-0089 D3a, and that never reached these blocks — a strict shell
   // over strip-mode children is not a closed surface, it is a closed surface's
   // silhouette.
@@ -253,27 +87,24 @@ describe('unknown keys are rejected, not stripped (#4001 batch 13)', () => {
 
     it('keeps parsing exactly what it parsed before — pinned', () => {
       // The showcase authors `responsiveStyles` on ~40 nodes in this shape
-      // (`examples/app-showcase/src/ui/pages/*.page.ts`); `page.test.ts` authors
-      // `responsive: { hiddenOn: [...] }`. Both must be untouched by this change.
+      // (`examples/app-showcase/src/ui/pages/*.page.ts`). It must be untouched
+      // by the #11027 retirement of its sibling.
       const parsed = PageComponentSchema.parse(component({
         responsiveStyles: {
           large: { fontSize: '40px', fontWeight: '700' },
           small: { fontSize: '30px' },
         },
-        responsive: { hiddenOn: ['xs', 'sm'], columns: { xs: 12, lg: 4 }, order: { lg: 1 } },
       }));
       expect(parsed.responsiveStyles?.large?.fontSize).toBe('40px');
-      expect(parsed.responsive?.hiddenOn).toEqual(['xs', 'sm']);
-      expect(parsed.responsive?.columns?.lg).toBe(4);
+      expect(parsed.responsiveStyles?.small?.fontSize).toBe('30px');
     });
 
     it('no longer accepts a component whose styling silently evaporates', () => {
-      // Before this change the SAME input parsed clean and returned
-      // `{ responsiveStyles: {}, responsive: {} }` — every styling and layout
-      // instruction the author wrote, gone, reported valid.
+      // Before #4001 批 13 the SAME input parsed clean and returned
+      // `{ responsiveStyles: {} }` — every styling instruction the author
+      // wrote, gone, reported valid.
       const result = PageComponentSchema.safeParse(component({
         responsiveStyles: { lg: { fontSize: '40px' } },
-        responsive: { colums: { lg: 4 }, hideOn: ['xs'] },
       }));
       expect(result.success).toBe(false);
     });
diff --git a/packages/spec/src/ui/responsive.zod.ts b/packages/spec/src/ui/responsive.zod.ts
index ad6c4a4347..1dc3df6386 100644
--- a/packages/spec/src/ui/responsive.zod.ts
+++ b/packages/spec/src/ui/responsive.zod.ts
@@ -6,247 +6,57 @@ import { lazySchema } from '../shared/lazy-schema';
 import { strictObject } from '../shared/strict-object';
 
 // ─────────────────────────────────────────────────────────────────────────────
-// WHY THIS FILE IS STRICT (#4001 批 13, ADR-0078) — engineering rationale; the
-// author-facing text is the JSDoc on each schema, which is what the generated
-// reference page renders.
+// THIS FILE USED TO CARRY TWO BREAKPOINT VOCABULARIES; ONE SURVIVES (#11027).
 //
-// THIS FILE CARRIES TWO BREAKPOINT VOCABULARIES, AND THEY SIT SIXTEEN LINES
-// APART ON THE SAME PAGE COMPONENT. `PageComponentSchema` declares both:
+// Until protocol 18 this file declared both channels `PageComponentSchema`
+// offered sixteen lines apart:
 //
 //     responsiveStyles: ResponsiveStylesSchema  // large | medium | small | xsmall
 //     responsive:       ResponsiveConfigSchema  // columns/order keyed xs … 2xl
 //
 // The first is desktop-first max-width buckets (ADR-0065, mirroring Builder.io's
-// SDK); the second is the Tailwind-style `BreakpointName` ramp declared at the
-// top of this file. Both are correct, neither is a typo of the other, and edit
-// distance cannot bridge `lg` → `large`. So the curation below is not decoration
-// — crossing the two vocabularies is THE mistake this file invites, and until
-// #4001 批 13 every crossing was silent.
+// SDK) and is LIVE: objectui's `compileScopedStyles` (`@object-ui/core`,
+// `styling/scoped-styles.ts`) compiles exactly `large`/`medium`/`small`/`xsmall`
+// into id-scoped CSS, and the showcase authors it on ~40 nodes.
 //
-// Measured on `main` before the change (`ResponsiveStylesSchema.parse`):
+// The second — the Tailwind-style `xs…2xl` layout config — was retired whole
+// (#11027, ADR-0049 D2). Measured across objectstack + objectui with the
+// tsc-probe methodology (positive and negative controls): objectui's two
+// implementations of the contract (`useResponsiveConfig` in `@object-ui/mobile`,
+// `ResponsiveProtocol` in `@object-ui/core`) had ZERO callers, nothing read
+// `.responsive` off a page component, and objectui's own node interface never
+// declared the key — so `page.components[].responsive`, the destination the
+// `dashboard.widgets[].responsive` tombstone (#4876) prescribed as "live",
+// applied exactly as much breakpoint behaviour as the key it retired: none.
+// `ResponsiveConfigSchema`, `BreakpointColumnMapSchema`,
+// `BreakpointOrderMapSchema` and the `BreakpointName` enum had no other
+// authorable carrier and left with the key (the PerformanceConfigSchema
+// precedent below — an exported schema with no consumer is read as a
+// capability, #3950). The removal record is the `retiredKey()` tombstone on
+// `page.zod.ts`, the protocol-18 `page-component-responsive-removed`
+// conversion, and `RETIRED_DEFS_BY_MAJOR[18]`.
 //
-//     { lg: { fontSize: '40px' } }             → {}
-//     { desktop: { fontSize: '40px' } }        → {}
-//     { columns: { large: 4, lg: 3 } }         → { columns: { lg: 3 } }
-//
-// The third one is the worst of the three: half the author's map survived, so
-// the node did lay out — at the wrong width, on the breakpoints they did not
-// name. And none of it was caught upstream, because THE OUTER GATE DOES NOT
-// RECURSE. `PageComponentSchema` has been `.strict()` since ADR-0089 D3a, and it
-// still accepted this whole component:
-//
-//     PageComponentSchema.parse({
-//       type: 'element:text', id: 't1',
-//       responsiveStyles: { lg: { fontSize: '40px' } },
-//       responsive: { colums: { lg: 4 }, hideOn: ['xs'] },
-//     })
-//     → { …, responsiveStyles: {}, responsive: {} }
-//
-// Every styling and layout instruction the author wrote, gone, reported valid.
-// That is the campaign's thesis in one parse: a strict shell over strip-mode
-// blocks is not a closed surface, it is a closed surface's silhouette.
-//
-// WHERE THIS BINDS, MEASURED — because a tightening must not claim reach it does
-// not have. The door is `getMetadataTypeSchema('page')`, i.e. the registry read
-// by `MetadataManager.validate`, `GET /api/v1/meta` and the Studio page form:
-// against it, the crossed vocabulary and the legacy breakpoint-keyed shape are
-// both rejected, and a clean page still parses. It does NOT bind in
-// `objectstack build` / `validate` — that path never parses page metadata at
-// all, which a control proves rather than a guess: a key `PageComponentSchema`
-// has rejected since ADR-0089 D3a passes both commands and lands in the built
-// artifact. That gap predates this change and is filed as #5000; it is recorded
-// here so nobody reads the campaign's usual "three example apps validate" line
-// as evidence for this surface.
-//
-// LIVENESS IS NOT WHAT THIS CHANGE CLAIMS. `responsiveStyles` is read —
-// objectui's `compileScopedStyles` (`@object-ui/core`, `styling/scoped-styles.ts`)
-// compiles exactly `large`/`medium`/`small`/`xsmall` into id-scoped CSS, and the
-// showcase authors it on ~40 nodes. `ResponsiveConfigSchema`'s own liveness is a
-// separate, open question tracked outside #4001 — closing a shape says which
-// keys it declares, never that a renderer reads them.
+// The #4001 批 13 strictness engineering (silent strip-mode blocks under a
+// strict shell, `lg` → `large` vocabulary crossings) is preserved on the
+// surviving shape below; the batch's measurements live in
+// `docs/audits/2026-07-unknown-key-strictness-ledger.md` (`responsive.zod.ts`
+// row) and the #4001 semantic entry.
 // ─────────────────────────────────────────────────────────────────────────────
 
-/**
- * Breakpoint Name Enum
- * Standard Tailwind-style breakpoint names (xs–2xl).
- */
-export const BreakpointName = z.enum(['xs', 'sm', 'md', 'lg', 'xl', '2xl']);
-
-export type BreakpointName = z.input<typeof BreakpointName>;
-
-/**
- * Aliases for the two per-breakpoint MAPS (`columns` / `order`), which are keyed
- * by {@link BreakpointName}.
- *
- * Anchored to a named sibling rather than to edit distance: the four targets are
- * the key set of {@link ResponsiveStylesSchema}, the OTHER breakpoint vocabulary
- * on the same page component. `large` → `lg` is a vocabulary crossing, not a
- * misspelling, so only a written-down entry can answer it.
- *
- * `xxl` is the one entry that is not a crossing — it is the recorded near-miss
- * for `2xl`, pinned as rejected by this file's own test since before #4001
- * (`responsive.test.ts`, "should reject invalid breakpoint names").
- */
-const BREAKPOINT_MAP_ALIASES = {
-  large: 'lg',
-  medium: 'md',
-  small: 'sm',
-  xsmall: 'xs',
-  xxl: '2xl',
-} as const;
-
-const BREAKPOINT_MAP_HISTORY =
-  'Until #4001 批 13 a breakpoint name this map does not declare was dropped silently — ' +
-  'the surviving half of the map still laid the node out, at the wrong width, on the ' +
-  'breakpoints the author never named.';
-
-/**
- * Breakpoint Column Map Schema
- * Maps breakpoint names to grid column counts (1-12).
- * All entries are optional — only specified breakpoints are configured.
- */
-export const BreakpointColumnMapSchema = lazySchema(() => strictObject(
-  {
-    surface: 'this per-breakpoint column map',
-    history: BREAKPOINT_MAP_HISTORY,
-    aliases: BREAKPOINT_MAP_ALIASES,
-  },
-  {
-    xs: z.number().min(1).max(12).optional(),
-    sm: z.number().min(1).max(12).optional(),
-    md: z.number().min(1).max(12).optional(),
-    lg: z.number().min(1).max(12).optional(),
-    xl: z.number().min(1).max(12).optional(),
-    '2xl': z.number().min(1).max(12).optional(),
-  },
-).describe('Grid columns per breakpoint (1-12)'));
-export type BreakpointColumnMap = z.input<typeof BreakpointColumnMapSchema>;
-
-/**
- * Breakpoint Order Map Schema
- * Maps breakpoint names to display order numbers.
- * All entries are optional — only specified breakpoints are configured.
- */
-export const BreakpointOrderMapSchema = lazySchema(() => strictObject(
-  {
-    surface: 'this per-breakpoint order map',
-    history: BREAKPOINT_MAP_HISTORY,
-    aliases: BREAKPOINT_MAP_ALIASES,
-  },
-  {
-    xs: z.number().optional(),
-    sm: z.number().optional(),
-    md: z.number().optional(),
-    lg: z.number().optional(),
-    xl: z.number().optional(),
-    '2xl': z.number().optional(),
-  },
-).describe('Display order per breakpoint'));
-export type BreakpointOrderMap = z.input<typeof BreakpointOrderMapSchema>;
-
-/**
- * A bare breakpoint name written at the `responsive` LEVEL rather than inside
- * one of its maps — the legacy breakpoint-keyed shape.
- *
- * This is not hypothetical: the retired `view.responsive` was authored that way,
- * and the conversion registry still carries `responsive: { sm: {} }` as the
- * `before` fixture of `view-inert-keys-removed`. A rename cannot answer it —
- * three different keys are plausible targets — so each name gets its own
- * prescription. Per-key rather than one shared string, because `guidance` emits
- * one bullet VERBATIM per offending key and a shared string prints the same
- * paragraph N times (the 批 10 `join`/`joinGateway` lesson).
- */
-const BREAKPOINT_AT_TOP_LEVEL = Object.fromEntries(
-  (['xs', 'sm', 'md', 'lg', 'xl', '2xl'] as const).map((bp) => [
-    bp,
-    `\`${bp}\` is a BREAKPOINT NAME, not a key on this block — the breakpoint-keyed ` +
-    `shape (\`responsive: { ${bp}: … }\`) belonged to \`view.responsive\`, retired in 17 ` +
-    `(#3896). Name the knob first, the breakpoint second: \`columns: { ${bp}: 6 }\`, ` +
-    `\`order: { ${bp}: 2 }\`, or \`hiddenOn: ['${bp}']\`.`,
-  ]),
-);
-
-/**
- * A key from the SIBLING vocabulary — `responsiveStyles`' max-width buckets —
- * written on the layout block instead. The fix is the sibling key on the same
- * component, so this is a wrong-layer pointer rather than a rename.
- */
-const STYLE_BUCKET_AT_LAYOUT_LEVEL = Object.fromEntries(
-  (['large', 'medium', 'small', 'xsmall'] as const).map((bucket) => [
-    bucket,
-    `\`${bucket}\` is a \`responsiveStyles\` bucket, not a \`responsive\` key — this block ` +
-    `configures LAYOUT (grid columns / visibility / order) on the \`xs\`…\`2xl\` axis. For ` +
-    `per-breakpoint CSS write the sibling key on this component: ` +
-    `\`responsiveStyles: { ${bucket}: { … } }\` (ADR-0065).`,
-  ]),
-);
-
-/**
- * Responsive Configuration Schema
- *
- * Provides responsive layout configuration for UI components.
- * Maps breakpoint names to layout behavior (columns, visibility, order).
- *
- * @example
- * ```typescript
- * const config: ResponsiveConfig = {
- *   columns: { xs: 12, sm: 6, lg: 4 },
- *   hiddenOn: ['xs'],
- *   order: { xs: 2, lg: 1 },
- * };
- * ```
+/*
+ * REMOVED — `BreakpointName`, `BreakpointColumnMapSchema` /
+ * `BreakpointColumnMap`, `BreakpointOrderMapSchema` / `BreakpointOrderMap`,
+ * `ResponsiveConfigSchema` / `ResponsiveConfig` (#11027, ADR-0049 D2). They
+ * typed the `responsive` layout block whose only remaining authorable carrier
+ * was `page.components[].responsive` (its widget sibling was retired in
+ * #4876, `view.responsive` in #3896): every carrier was authorable and inert
+ * — no renderer or runtime ever applied a per-breakpoint column count,
+ * display order, or visibility from it. An exported schema with no consumer
+ * is read as a capability by whoever finds it (#3950 precedent; exactly how
+ * `PerformanceConfigSchema` left in the #3896 close-out). The Tailwind-style
+ * `xs…2xl` layout vocabulary returns if and when a renderer implements it —
+ * in one change, with the engine (the #4834 rule).
  */
-export const ResponsiveConfigSchema = lazySchema(() => strictObject(
-  {
-    surface: 'this responsive layout configuration',
-    history:
-      'Until #4001 批 13 these were dropped silently — and the component around them ' +
-      'parsed clean, because `PageComponentSchema` is strict only at its own level.',
-    aliases: {
-      // objectui's `useResponsiveConfig` resolves this block and returns
-      // `{ hidden, columns, order, breakpoint }` (`@object-ui/mobile`,
-      // `useResponsiveConfig.ts`). `hidden` is that RESULT's spelling of the
-      // authored `hiddenOn`, which is where the wrong word comes from.
-      hidden: 'hiddenOn',
-      // `hideOn` USED to need an entry here. It is not a different word — it is
-      // the same word, and the distance fallback could not reach it only
-      // because of #4990: the fallback lowercased the INPUT but not the
-      // CANDIDATES, so `hiddenOn`'s capital O cost an extra edit and `hideOn`
-      // scored 3 against a budget of 2, while the all-lowercase `hiddenon`
-      // scored 1 and resolved fine. #4990 fixed that at the source by folding
-      // case on both sides, so this per-case workaround is retired: `hideOn`
-      // now reaches `hiddenOn` on distance alone. The measurement that
-      // justified the entry is preserved as an assertion in `responsive.test.ts`
-      // ("reaches `hiddenOn` from both wrong spellings") rather than as a
-      // comment, so it fails if the general fix ever regresses.
-    },
-    guidance: {
-      ...BREAKPOINT_AT_TOP_LEVEL,
-      ...STYLE_BUCKET_AT_LAYOUT_LEVEL,
-      responsiveStyles:
-        '`responsiveStyles` is a SIBLING key on the component, not a key inside ' +
-        '`responsive`. Move it out one level: `{ …component, responsive: { … }, ' +
-        'responsiveStyles: { large: { … } } }` (ADR-0065).',
-    },
-  },
-  {
-    /** Minimum breakpoint for visibility */
-    breakpoint: BreakpointName.optional()
-      .describe('Minimum breakpoint for visibility'),
-
-    /** Hide on specific breakpoints */
-    hiddenOn: z.array(BreakpointName).optional()
-      .describe('Hide on these breakpoints'),
-
-    /** Grid columns per breakpoint (1-12 column grid) */
-    columns: BreakpointColumnMapSchema.optional().describe('Grid columns per breakpoint'),
-
-    /** Display order per breakpoint */
-    order: BreakpointOrderMapSchema.optional().describe('Display order per breakpoint'),
-  },
-).describe('Responsive layout configuration'));
-
-export type ResponsiveConfig = z.input<typeof ResponsiveConfigSchema>;
 
 /**
  * Style Map Schema (ADR-0065)
@@ -280,9 +90,11 @@ export type StyleMap = z.input<typeof StyleMapSchema>;
  * collision-free, responsive-correct. Desktop-first: `large` is the
  * unconditional base; `medium`/`small`/`xsmall` are `max-width` overrides.
  *
- * Distinct from {@link ResponsiveConfigSchema}, which configures *layout* (grid
- * columns / visibility / order) on the Tailwind `xs..2xl` axis. This styles a
- * node's own box; that arranges a node within a grid.
+ * Since #11027 this is the ONLY per-breakpoint channel on a page component: the
+ * sibling `responsive` layout block (grid columns / visibility / order on a
+ * Tailwind `xs..2xl` axis) was authorable and inert, and was retired under
+ * ADR-0049 D2. Express layout per breakpoint as CSS here instead — see the
+ * `guidance` entries below for the per-knob translations.
  */
 export const ResponsiveStylesSchema = lazySchema(() => strictObject(
   {
@@ -292,12 +104,13 @@ export const ResponsiveStylesSchema = lazySchema(() => strictObject(
       'and since the whole block is optional, a node whose every style was written ' +
       'under the wrong vocabulary rendered completely unstyled and parsed clean.',
     aliases: {
-      // The Tailwind ramp is `BreakpointName`, declared at the top of this file
-      // and used by the SIBLING `responsive` key on the same page component.
-      // Mapped onto the max-width bucket that contains each one: objectui's
-      // `STYLE_BREAKPOINTS` cuts at medium ≤991px, small ≤640px, xsmall ≤479px
-      // (`@object-ui/core`, `styling/scoped-styles.ts`), and `large` is the
-      // unconditional base, so everything above `md` lands there.
+      // The Tailwind ramp (`xs`…`2xl`) is the vocabulary the retired sibling
+      // `responsive` block was keyed by (#11027), and the one authors carry in
+      // from Tailwind itself. Mapped onto the max-width bucket that contains
+      // each name: objectui's `STYLE_BREAKPOINTS` cuts at medium ≤991px,
+      // small ≤640px, xsmall ≤479px (`@object-ui/core`,
+      // `styling/scoped-styles.ts`), and `large` is the unconditional base, so
+      // everything above `md` lands there.
       xs: 'xsmall',
       sm: 'small',
       md: 'medium',
@@ -306,18 +119,22 @@ export const ResponsiveStylesSchema = lazySchema(() => strictObject(
       '2xl': 'large',
     },
     guidance: {
+      // The three knobs of the RETIRED `responsive` layout block (#11027,
+      // ADR-0049 D2 — no renderer ever applied them). An author who lands one
+      // here is usually migrating off that block, so each entry carries the
+      // CSS translation that IS applied.
       columns:
-        '`columns` is a `responsive` key, not a `responsiveStyles` bucket — this block ' +
-        'holds per-breakpoint CSS. For a grid column count write the sibling key on this ' +
-        'component: `responsive: { columns: { lg: 4 } }`.',
+        '`columns` was a key of the retired `responsive` layout block (#11027 — no renderer ' +
+        'ever applied it). This block holds per-breakpoint CSS. Express a column span as CSS ' +
+        "on the bucket where it should apply, e.g. `medium: { gridColumn: 'span 6' }`.",
       hiddenOn:
-        '`hiddenOn` is a `responsive` key, not a `responsiveStyles` bucket. Write the ' +
-        "sibling key on this component: `responsive: { hiddenOn: ['xs'] }` — or express it " +
-        'as CSS here with `xsmall: { display: \'none\' }`.',
+        '`hiddenOn` was a key of the retired `responsive` layout block (#11027 — no renderer ' +
+        'ever applied it). This block holds per-breakpoint CSS. Hide a component per ' +
+        "breakpoint with CSS, e.g. `xsmall: { display: 'none' }`.",
       order:
-        '`order` is a `responsive` key, not a `responsiveStyles` bucket. Write the sibling ' +
-        'key on this component: `responsive: { order: { lg: 1 } }` — or express it as CSS ' +
-        "here with `large: { order: '1' }`.",
+        '`order` was a key of the retired `responsive` layout block (#11027 — no renderer ' +
+        'ever applied it). This block holds per-breakpoint CSS. Set display order per ' +
+        "breakpoint with CSS, e.g. `small: { order: '1' }`.",
     },
   },
   {
diff --git a/packages/spec/src/ui/widget-i18n-retirement.test.ts b/packages/spec/src/ui/widget-i18n-retirement.test.ts
index efdb12cb13..3f17653d6f 100644
--- a/packages/spec/src/ui/widget-i18n-retirement.test.ts
+++ b/packages/spec/src/ui/widget-i18n-retirement.test.ts
@@ -105,7 +105,8 @@ describe('[#5055] ui/ widget + i18n family retirement', () => {
     'AriaPropsSchema',
     'I18nLabelSchema',
     // Neighbours a too-wide `ui/` sweep would plausibly take.
-    'ResponsiveConfigSchema',
+    // (`ResponsiveConfigSchema` stood here until #11027 retired the responsive
+    // layout surface whole — a survivor list entry follows its subject out.)
     'NotificationTypeSchema',
     'SharingConfigSchema',
     // (`ThemeSchema` stood here until #10485 retired the theme surface whole.)
diff --git a/skills/objectstack-ui/references/_index.md b/skills/objectstack-ui/references/_index.md
index 01f52e6a46..73d2513d4c 100644
--- a/skills/objectstack-ui/references/_index.md
+++ b/skills/objectstack-ui/references/_index.md
@@ -40,7 +40,7 @@ from `node_modules` — there is no local copy in the skill bundle.
 - `node_modules/@objectstack/spec/src/ui/action-params.zod.ts` — The action DISPATCH contract: what the platform validates on the way in, and
 - `node_modules/@objectstack/spec/src/ui/bulk-action.zod.ts` — Bulk Action Schemas
 - `node_modules/@objectstack/spec/src/ui/i18n.zod.ts` — Display-label and ARIA-label primitives shared by every `ui/` shape.
-- `node_modules/@objectstack/spec/src/ui/responsive.zod.ts` — Breakpoint Name Enum
+- `node_modules/@objectstack/spec/src/ui/responsive.zod.ts` — Style Map Schema (ADR-0065)
 - `node_modules/@objectstack/spec/src/ui/sharing.zod.ts` — Sharing & Embedding Protocol
 
 ## How to read these

From 7125cdc6e85cbdb38ace31c5c588868b15618691 Mon Sep 17 00:00:00 2001
From: Claude <noreply@anthropic.com>
Date: Mon, 24 Aug 2026 12:43:39 +0000
Subject: [PATCH 2/3] =?UTF-8?q?revert(skills):=20drop=20the=20generated=20?=
 =?UTF-8?q?=5Findex.md=20hunk=20from=20this=20PR=20=E2=80=94=20skills/**?=
 =?UTF-8?q?=20is=20a=20governed=20surface?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

One governed-path hit forks the whole PR to human-merge-only (AGENTS.md Prime
Directive #14: a mixed diff is not a proportion question). The regenerated
skill-reference line moves to its own PR, which lands only after this
retirement — until then check:skill-refs reads the committed line as stale
against this branch's sources by design.

Part of #11027

Co-Authored-By: Claude <noreply@anthropic.com>
---
 skills/objectstack-ui/references/_index.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/skills/objectstack-ui/references/_index.md b/skills/objectstack-ui/references/_index.md
index 73d2513d4c..01f52e6a46 100644
--- a/skills/objectstack-ui/references/_index.md
+++ b/skills/objectstack-ui/references/_index.md
@@ -40,7 +40,7 @@ from `node_modules` — there is no local copy in the skill bundle.
 - `node_modules/@objectstack/spec/src/ui/action-params.zod.ts` — The action DISPATCH contract: what the platform validates on the way in, and
 - `node_modules/@objectstack/spec/src/ui/bulk-action.zod.ts` — Bulk Action Schemas
 - `node_modules/@objectstack/spec/src/ui/i18n.zod.ts` — Display-label and ARIA-label primitives shared by every `ui/` shape.
-- `node_modules/@objectstack/spec/src/ui/responsive.zod.ts` — Style Map Schema (ADR-0065)
+- `node_modules/@objectstack/spec/src/ui/responsive.zod.ts` — Breakpoint Name Enum
 - `node_modules/@objectstack/spec/src/ui/sharing.zod.ts` — Sharing & Embedding Protocol
 
 ## How to read these

From d9bb37b2828dcbff2f6f62ebdbda514a42667add Mon Sep 17 00:00:00 2001
From: Claude <noreply@anthropic.com>
Date: Mon, 24 Aug 2026 13:21:25 +0000
Subject: [PATCH 3/3] =?UTF-8?q?revert(skills):=20restore=20the=20regenerat?=
 =?UTF-8?q?ed=20=5Findex.md=20line=20=E2=80=94=20PM=20withdrew=20the=20gov?=
 =?UTF-8?q?erned-surface=20split?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

check:skill-refs byte-compares the committed index against a fresh render of
this tree's own sources, so the generator-owned line must ride the source PR:
split out, it left this branch (and would have left main, between the two
landings) red on that gate. Regenerated with gen:skill-refs, verified in sync.

Part of #11027

Co-Authored-By: Claude <noreply@anthropic.com>
---
 skills/objectstack-ui/references/_index.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/skills/objectstack-ui/references/_index.md b/skills/objectstack-ui/references/_index.md
index 01f52e6a46..73d2513d4c 100644
--- a/skills/objectstack-ui/references/_index.md
+++ b/skills/objectstack-ui/references/_index.md
@@ -40,7 +40,7 @@ from `node_modules` — there is no local copy in the skill bundle.
 - `node_modules/@objectstack/spec/src/ui/action-params.zod.ts` — The action DISPATCH contract: what the platform validates on the way in, and
 - `node_modules/@objectstack/spec/src/ui/bulk-action.zod.ts` — Bulk Action Schemas
 - `node_modules/@objectstack/spec/src/ui/i18n.zod.ts` — Display-label and ARIA-label primitives shared by every `ui/` shape.
-- `node_modules/@objectstack/spec/src/ui/responsive.zod.ts` — Breakpoint Name Enum
+- `node_modules/@objectstack/spec/src/ui/responsive.zod.ts` — Style Map Schema (ADR-0065)
 - `node_modules/@objectstack/spec/src/ui/sharing.zod.ts` — Sharing & Embedding Protocol
 
 ## How to read these