fix(console-ai): reliable handoff auto-send + second-handoff context re-carry (ADR-0057 P4)

[os-zhuang]

Two reliability follow-ups to the P4 "Open in Builder →" handoff (#2439 / #2444). Backend counterpart: objectstack-ai/cloud#820 — merge that first (without it the re-carried context on a second handoff is sent but dropped server-side; not a regression, just inert).

1. Handoff auto-send swallow — fixed

The handoff's auto-sent first message could be dropped on a brand-new build conversation: the seed effect gated on the async-resolvedactiveAgent, which can settle afterPOST /conversations mints the id. The deferred-send replay only re-ran on id/doSend changes, so a seed landing post-id was never replayed — conversation created, no …/chat, empty Builder (observed live in the previous verification run; tenant DB showed the build conv with 0 messages).

Fix, two halves:

• Seed gates on the route (agentSegment, known synchronously), not activeAgent.
• The page stashes via stashPendingFirstMessage which bumps a pendingFirstMessageSeq; useDeferredFirstSend lists that pendingSignal in its replay deps, so an out-of-band seed replays even when the id already resolved.

Live-verified on the local rig (fresh registration → ask decline → click card): the build first turn auto-fired with context.parentConversationId captured on the wire, and the agent produced a blueprint. This was the exact scenario that swallowed before.

2. Second handoff re-carries the latest ask context

Build conversations are singletons per (user, app, product), and the ask thread is too — so a second handoff re-supplies the same parent id. The transport now re-arms on each falsy→truthy transition of the prop (the URL-mirror strips the param between handoffs, producing the edge), and the seed re-arms on each new handoffPrompt. Live-verified: after a second "Open in Builder →", the next build turn carried parentConversationId again.

Known residual (issue to follow, linked after filing)

The auto-send of the second prompt into an already-existing, mid-flight build conversation (first blueprint still Awaiting Approval) does not fire — the user sends once manually and the context still carries. Suspected hydration race: with an existing conversation the id is present at mount, so the replay fires before useChat finishes hydrating. Not a regression — before this PR a second handoff did nothing at all.

Tests

18/18 green: new pendingSignal post-id-seed replay (incl. a second bump), transport re-carry across strip→re-supply, plus all existing deferred-send / handoff-context / send-failure suites.

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1 Skipped Deployment

Project	Deployment	Actions	Updated (UTC)
objectui	Ignored		Jul 13, 2026 12:37pm

[os-zhuang]

Residual (second-handoff auto-send into a hydrating conversation) tracked in #2450.

[github-actions]

✅ Console Performance Budget

Metric	Value	Budget
Main entry (gzip)	26.5 KB	350 KB
Entry file	index-DQZmHQtC.js	—
Status	PASS	—

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📦 Bundle Size Report

Package	Size	Gzipped
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auth (LoginForm.js)	16.53KB	4.84KB
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auth (UserMenu.js)	3.40KB	1.22KB
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auth (index.js)	1.83KB	0.79KB
auth (phone-identifier.js)	1.11KB	0.66KB
auth (types.js)	0.59KB	0.35KB
auth (useAuth.js)	4.86KB	0.85KB
auth (useIsWorkspaceAdmin.js)	1.61KB	0.85KB
collaboration (CommentThread.js)	18.38KB	4.49KB
collaboration (LiveCursors.js)	3.17KB	1.27KB
collaboration (PresenceAvatars.js)	3.65KB	1.42KB
collaboration (PresenceProvider.js)	2.42KB	0.96KB
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collaboration (useConflictResolution.js)	7.75KB	1.86KB
collaboration (useMentionNotifications.js)	1.81KB	0.68KB
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plugin-kanban (index.js)	48.16KB	12.94KB
plugin-list (index.js)	98.18KB	23.16KB
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types (data-display.js)	0.20KB	0.18KB
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types (designer.js)	0.77KB	0.41KB
types (disclosure.js)	0.20KB	0.18KB
types (feedback.js)	0.20KB	0.18KB
types (field-types.js)	0.20KB	0.18KB
types (form.js)	0.20KB	0.18KB
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types (layout.js)	0.20KB	0.18KB
types (mobile.js)	0.20KB	0.18KB
types (navigation.js)	0.20KB	0.18KB
types (objectql.js)	0.20KB	0.18KB
types (overlay.js)	0.20KB	0.18KB
types (permissions.js)	0.20KB	0.18KB
types (plugin-scope.js)	0.20KB	0.18KB
types (record-components.js)	0.20KB	0.19KB
types (registry.js)	0.20KB	0.18KB
types (reports.js)	0.20KB	0.18KB
types (spec-report.js)	5.26KB	1.96KB
types (tenant.js)	0.20KB	0.18KB
types (theme.js)	0.20KB	0.18KB
types (ui-action.js)	0.75KB	0.46KB
types (views.js)	0.20KB	0.18KB
types (widget.js)	0.20KB	0.18KB

Size Limits

• ✅ Core packages should be < 50KB gzipped
• ✅ Component packages should be < 100KB gzipped
• ⚠️ Plugin packages should be < 150KB gzipped