docs(core): admit S5-B1 canonical migration source & payload evidence

[qnbs]

User description

Summary

• Admits the S5-B1 child contract (S5-B1: Canonical Migration Source & Payload Evidence (R-15 child contract) #577, child of security(core/R-15): renderer-neutral encrypted desktop storage, durable migration & identity binding #445) that PR docs(core): define R-15 secure storage contract (#445) #564's S5-A baseline left as an explicit fail-closed blocker across four locations.
• New file docs/native/r15/MIGRATION-SOURCE-EVIDENCE.md defines: canonical JSON encoding (recursive object-key sorting, resolving the actual non-determinism in independent JSON.stringify reconstructions); source_evidence_digest for the packaged-IDB-fallback representation per compressData()'s two actual stored forms; canonical_destination_payload_bytes in two buckets (binary-native raw bytes vs. canonical-JSON for the majority JSON-shaped classes) derived from inspecting real current storage shape, not per-class bespoke codecs; atomic-write-temporary reconciliation; and identity-upgrade paths for SOURCE_IDENTITY_UNBOUND sources and legacy quarantine recovery-IDs.
• Updates the parent contract's four S5-B1 blocker locations (§3 quarantine, §10.1.2 unbound-identity, §10.1.3 main blocker, §10.4.1 atomic-write-temporaries), header status flags, and §21 to record S5_B1_ADMITTED = YES; updates CORE-MIGRATION-LEDGER.md row 10 accordingly.
• S5-B3 (S5-B3: Chunked Large-Object Envelope (R-15 child contract) #579) remains the sole open child contract; S5_TERMINAL requires it too.

Design only — no implementation, no production authority switch, no change to any S5-A/S5-B2 mechanism.

Test plan

• pnpm run docs:check / pnpm run ci:prepush green
• PR Size Governance advisory check passes (target ≤400 lines for a child contract; measured 182)
• Review-thread convergence (0 unresolved) before merge, per this repo's standing PR workflow

Summary by Sourcery

Admit the S5-B1 migration evidence contract while keeping the changes design-only and leaving production authority unchanged.

New Features:

• Define canonical source-evidence and destination-payload encodings for migration across filesystem and IndexedDB storage representations.
• Specify deterministic reconciliation and retention rules for surviving atomic-write temporary files.
• Define user-confirmed identity upgrades for eligible unbound sources and durable recovery-ID assignment for legacy quarantine data.

Enhancements:

• Admit S5-B1 and update the secure-storage contract and migration ledger, leaving S5-B3 as the sole remaining child-contract gate.

Documentation:

• Add the S5-B1 migration source and payload evidence contract and document its required validation vectors and non-goals.

Tests:

• Document headless golden vectors and fixtures required before production admission.

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CodeAnt-AI Description

Admit canonical migration evidence rules and close the S5-B1 design blockers

What Changed

• Defines stable encodings for packaged IndexedDB fallback data and destination payloads, allowing equivalent records from different storage sources to be compared consistently.
• Establishes safe handling for leftover atomic-write temporary files: redundant copies may be cleaned up only after retention requirements are met, while conflicts, orphans, and unreadable data are preserved and surfaced for recovery.
• Defines explicit user-confirmed recovery for sources without embedded identity; unattended migration remains blocked instead of guessing ownership.
• Assigns durable recovery IDs to legacy quarantine directories without deriving identity from directory names.
• Marks S5-B1 as admitted and updates the storage contract and migration ledger; S5-B3 remains the only outstanding child contract, with no implementation or production authority switch introduced.

Impact

✅ Consistent cross-storage migration comparisons
✅ Fewer unsafe temporary-file deletions
✅ Safer recovery of ambiguous and quarantined data

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Summary by CodeRabbit

• Documentation
  • Updated secure storage migration documentation to admit S5-B1 and S5-B2.
  • Added specifications for canonical migration evidence, destination payload serialization, source identity recovery, quarantine recovery IDs, and atomic-write reconciliation.
  • Documented required proof fixtures and clarified that S5-B3 remains the sole blocking contract.
  • No production implementation or authority switch was introduced.

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🤖 CodeAnt AI — Review Status

Status	Commit	Started (UTC)	Finished (UTC)
✅ Reviewed your PR	6296613	Sep 02, 2026 · 06:49	06:49

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Reviewer's Guide

This documentation-only PR admits S5-B1 by specifying canonical source evidence, destination payload equivalence, atomic-write-temporary reconciliation, and identity-upgrade/recovery rules, then synchronizes the parent contract and ledger while leaving implementation, production authority, and S5-B3 unchanged.

Sequence diagram for S5-B1 identity upgrade and quarantine recovery

sequenceDiagram
participant Core
actor User
participant Journal
participant AuthenticatedStore
Core->>Core: DISCOVER
alt SOURCE_IDENTITY_UNBOUND
Core->>User: Present ambiguous source for confirmation
User-->>Core: Confirm destination identity
Core->>AuthenticatedStore: Write fresh AAD-bound envelope
else Unattended migration
Core-->>Core: Block identity upgrade
end
alt Legacy quarantine directory
Core->>Core: Assign fresh recovery-id
Core->>Journal: Persist directory-to-recovery-id mapping
Journal-->>Core: Confirm durable mapping
end

Loading

Flow diagram for S5-B1 migration evidence decisions

flowchart TD
A["Discover migration source"] --> B{"Source representation"}
B -->|"Packaged IDB fallback"| C["Freeze stored form and source_evidence_digest"]
B -->|"Filesystem or other source"| D["Open and validate source"]
C --> E["Authenticate and validate identity"]
D --> E
E --> F{"Destination payload shape"}
F -->|"Binary-native"| G["Use parsed raw bytes"]
F -->|"JSON-shaped"| H["Use canonical_json_bytes"]
G --> I["Compute source_value_digest"]
H --> I
I --> J["Compare candidates for migration disposition"]

Loading

Flow diagram for atomic-write-temporary reconciliation

flowchart TD
A["Discover target and sibling temporary"] --> B{"Owner resolves?"}
B -->|"No"| C["Preserve orphan; recovery required"]
B -->|"Yes"| D{"Temporary and target comparison"}
D -->|"Equal"| E["Mark redundant; cleanup only after durable disposition"]
D -->|"Different"| F["Preserve both; block authority switch"]
D -->|"Target missing or unreadable"| G["Use temporary as migration candidate via authenticated write"]
D -->|"Both missing or unreadable"| H["Mark recovery required"]

Loading

File-Level Changes

Change	Details	Files
Adds the admitted S5-B1 canonical migration source and payload evidence contract.	Defines recursive canonical JSON encoding with UTF-8 key ordering and deterministic number/string handling. Defines packaged-IDB source evidence hashing for raw structured-clone and exact LZ-compressed storage forms. Defines destination payload bytes using raw bytes for binary-native classes and canonical JSON for JSON-shaped classes. Preserves distinct source-evidence and value-equivalence digest semantics and adds representation/version-specific rules.	docs/native/r15/MIGRATION-SOURCE-EVIDENCE.md
Defines deterministic handling for crash-left atomic-write temporary files.	Discovers and derives temporary ownership from canonical physical paths without treating filenames as identity. Compares temporary and target contents canonically, preserving conflicts and orphaned artifacts. Restricts cleanup until migration disposition and rollback-retention requirements are satisfied.	docs/native/r15/MIGRATION-SOURCE-EVIDENCE.md docs/native/R15-SECURE-STORAGE-CONTRACT.md
Admits identity recovery paths for previously unbound sources and legacy quarantine data.	Requires explicit user-confirmed re-keying through the normal authenticated write path for SOURCE_IDENTITY_UNBOUND sources. Assigns fresh Core-generated quarantine recovery IDs and journals directory-to-ID mappings before use. Keeps unattended ambiguous sources blocked and prevents identity derivation from filenames or inferred content.	docs/native/r15/MIGRATION-SOURCE-EVIDENCE.md docs/native/R15-SECURE-STORAGE-CONTRACT.md
Updates the parent storage contract and migration ledger to reflect S5-B1 admission.	Marks S5_B1_ADMITTED as YES while retaining implementation readiness and production authority as disabled. Replaces the four S5-B1 fail-closed blocker statements with references to the admitted contract. Records S5-B3 as the sole remaining S5 child gate.	docs/native/R15-SECURE-STORAGE-CONTRACT.md docs/native/CORE-MIGRATION-LEDGER.md

Possibly linked issues

• S5-B1: Canonical Migration Source & Payload Evidence (R-15 child contract) #577: The PR directly implements the issue’s design scope by admitting the S5-B1 migration-evidence contract.

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🏁 CodeAnt Quality Gate Results

Commit:c96003a5
Scan Time: 2026-09-02 07:33:09 UTC

✅ Overall Status: PASSED

Quality Gate Details

Quality Gate	Status	Details
Secrets	✅ PASSED	0 secrets found
Duplicate Code	✅ PASSED	0.0% duplicated
SAST	✅ PASSED	No security issues
Bugs	✅ PASSED	Rating S: No bugs
IAC	✅ PASSED	No IAC issues

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DeepSource Code Review

We reviewed changes in 12d1478...c96003a on this pull request. Below is the summary for the review, and you can see the individual issues we found as inline review comments.

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PR Report Card

Overall Grade

Security Reliability Complexity Hygiene

Code Review Summary

Analyzer	Status	Updated (UTC)	Details
Docker		Sep 2, 2026 7:31a.m.	Review ↗
JavaScript		Sep 2, 2026 7:31a.m.	Review ↗
Python		Sep 2, 2026 7:31a.m.	Review ↗
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[amazon-q-developer]

Documentation update correctly admits S5-B1 child contract. All cross-references updated consistently, no defects found.

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Review configuration:

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Essentials

Run ID: 0d194acb-c17c-418b-9fc7-08fc67c5d2f6

📥 Commits

Reviewing files that changed from the base of the PR and between 6296613 and c96003a.

📒 Files selected for processing (2)

• docs/native/R15-SECURE-STORAGE-CONTRACT.md
• docs/native/r15/MIGRATION-SOURCE-EVIDENCE.md

📝 Walkthrough

Walkthrough

The change adds the S5-B1 migration-source evidence specification and admits S5-B1 and S5-B2 in the secure-storage contract and R-15 ledger. Production implementation and authority switching remain gated by S5-B3.

Changes

S5 migration evidence admission

Layer / File(s)	Summary
Canonical migration evidence specification docs/native/r15/MIGRATION-SOURCE-EVIDENCE.md	Defines canonical serialization, evidence and destination digests, temporary-file reconciliation, identity upgrades, quarantine recovery IDs, validation fixtures, and non-goals.
Secure-storage migration procedures docs/native/R15-SECURE-STORAGE-CONTRACT.md	Admits packaged-IDB evidence, destination payload encoding, explicit identity upgrades, quarantine recovery IDs, and deterministic temporary-file reconciliation.
Migration admission ledger update docs/native/CORE-MIGRATION-LEDGER.md	Records S5-B1 and S5-B2 as admitted and identifies S5-B3 as the sole remaining blocker. Implementation readiness and terminal status remain negative.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Merge Risk:🟡 Moderate · up to 62966

This documentation-only PR admits deterministic migration evidence and recovery rules, but several required cases remain ambiguous, including binary/blob payloads, duplicate JSON members, packaged storage bytes, atomic-write recovery, and credential handling. Merge should wait for those contract clarifications to avoid inconsistent comparisons, unsafe recovery decisions, or incorrect handling of protected data.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly and concisely identifies the main change: documenting and admitting S5-B1 canonical migration source and payload evidence.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

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Actionable comments posted: 6

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Inline comments:
In `@docs/native/R15-SECURE-STORAGE-CONTRACT.md`:
- Line 2375: Update the S5-B1 admitted packaged-IDB evidence wording to
explicitly state both byte rules from MIGRATION-SOURCE-EVIDENCE.md: hash
canonical_json_bytes(data) for raw structured-cloned values, and the UTF-8 bytes
of the exact persisted prefixed compressed string for compressed values; remove
the ambiguous “stored structured-clone value” phrasing.
In `@docs/native/r15/MIGRATION-SOURCE-EVIDENCE.md`:
- Around line 95-101: Update the Bucket B classification and codec definitions
so non-JSON classes use exact payload-byte rules instead of
canonical_json_bytes(parsed_value): specify base64-text decoding for Global
images, archive boundaries and encrypted ZIP bytes for Library backups,
preserved directory-tree encoding for Quarantine/recovery data, and
deterministic metadata/blob boundaries for LoRA adapters, datasets, and run
metadata. Define these codecs before computing source_value_digest and keep JSON
canonicalization only for genuinely JSON-shaped classes.
- Around line 36-39: Update the canonical JSON migration guidance around
canonical_json and the required fixture to require a duplicate-detecting parse
step before materializing objects, including for JSON.parse-based uncompressed
inputs. Ensure duplicate member names are rejected before canonical_json
receives the value, rather than relying on the encoder to detect them.
- Around line 111-113: Update the Owner derivation rules for temporary files so
the class registry resolves the expected canonical path and record identity even
when the owning target file is absent, allowing crash-before-promotion
temporaries to remain candidates. Classify a prefix as orphan only when no
registered class claims it, rather than merely when no currently existing owned
record is found.
- Around line 125-129: Define the unreadable-temporary/readable-target case in
the migration evidence table as an explicit preserve-and-block outcome, or a
named typed failure with equivalent authority-blocking behavior; do not infer
authority from the readable target alone. Add a fixture covering a corrupt,
truncated, or otherwise unparseable temporary alongside a readable target.
- Line 143: Restrict the SOURCE_IDENTITY_UNBOUND identity-upgrade procedure in
docs/native/r15/MIGRATION-SOURCE-EVIDENCE.md lines 143-143 to MIGRATE_TO_R15
sources, removing CREDENTIAL_IDB_KEYSTORE_V1 from the ordinary §9 R-15 write
path unless a separate native-secret decision permits it. Align the parent
admission text in docs/native/R15-SECURE-STORAGE-CONTRACT.md lines 2165-2171
with the dedicated credential-authority disposition and define credential
recovery outside ordinary R-15 migration.

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📒 Files selected for processing (3)

• docs/native/CORE-MIGRATION-LEDGER.md
• docs/native/R15-SECURE-STORAGE-CONTRACT.md
• docs/native/r15/MIGRATION-SOURCE-EVIDENCE.md

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