[#254] feat: pair-capability-checkpoint (write/resume, handoff)

[rucka]

PR Information

PR Title: [#254] feat: pair-capability-checkpoint (write/resume, handoff)
Story/Epic: #254 (Story) — Parent Epic #206 (Split implement: checkpoint + publish-pr)
Type: Feature
Priority: High (P0 — Must-Have)
Assignee: N/A
Reviewers: N/A
Labels: user story

Summary

What Changed

New capability skill checkpoint (packages/knowledge-hub/dataset/.skills/capability/checkpoint/SKILL.md): writes and resumes a self-contained progress checkpoint (story, branch, tasks done, key decisions, remaining todos), so work survives context resets and a fresh session or subagent can resume where a prior one stopped. Two modes: write (persist or write-free return) and resume (locate + parse). Backed by a new checkpoint-template.md (five state sections + an authoring-only Template Notes appendix), registered in the templates catalog, and documented in the public skills catalog under a new "State and Handoff Capabilities" section.

Why This Change

Long pair sessions lose context on reset; there was no documented convention for handing off in-progress story state. This closes that gap as an atomic, independently invocable capability — enabling primitive for a future /implement closing phase (story #256) and a future /publish-pr handoff (same epic split, #206).

Story Context

User Story: As a developer working through long pair sessions, I want pair-capability-checkpoint — writes and resumes a self-contained progress state (story, branch, completed tasks, decisions, remaining todos) in .pair/working/checkpoints/ and/or the issue body — so that work survives context resets.

Acceptance Criteria: AC1 (write mode produces a checkpoint readable with zero prior context), AC2 (resume mode returns parsed state), AC3 (write is update-in-place, one file per story), AC4 (write-free return option for composers) — all four addressed; see Detailed Comments below for verification notes.

Changes Made

Implementation Details

• Change 1: Authored checkpoint-template.md — 5 state sections (Story, Branch, Tasks Done, Key Decisions, Remaining Todos) + Template Notes appendix with explicit "omit from rendered checkpoints" disclaimer (T-1).
• Change 2: Authored SKILL.md write mode — Steps 1–5: resolve story context (HALT if undetectable), route by mode, gather/reconstruct state, detect existing checkpoint + dedupe, render and persist-or-return per $persist (T-2).
• Change 3: Authored SKILL.md resume mode — Steps 6–8: locate (HALT if none, dedupe by most-recent), parse 5 sections while ignoring the trailing Template Notes appendix, report parsed state; explicit edge cases for missing/corrupted/duplicate checkpoints (T-3).
• Change 4: Registered the template in templates/README.md; added a "State and Handoff Capabilities" section to the public skills catalog (skills-catalog.mdx), bumping the skill count 33 → 34 (T-4).

Files Changed

• Modified: packages/knowledge-hub/dataset/.pair/knowledge/guidelines/collaboration/templates/README.md, apps/website/content/docs/reference/skills-catalog.mdx
• Added: packages/knowledge-hub/dataset/.skills/capability/checkpoint/SKILL.md, packages/knowledge-hub/dataset/.pair/knowledge/guidelines/collaboration/templates/checkpoint-template.md
• Deleted: None
• Renamed: None

Database Changes

• Schema Changes: N/A
• Migration Scripts: N/A
• Data Changes: N/A
• Performance Impact: N/A

API Changes

• New Endpoints: N/A
• Modified Endpoints: N/A
• Breaking Changes: N/A
• Documentation: N/A

Testing

Test Coverage

• Unit Tests: N/A — this is a KB-authored capability skill (Markdown instructions for an LLM agent), not executable code; no unit-testable surface.
• Integration Tests: N/A — same reason.
• End-to-End Tests: pnpm --filter @pair/website e2e covers the docs-site catalog page this PR modifies (35/35 passing).
• Manual Testing: Reportedly completed by the implementer per issue pair-capability-checkpoint — resumable state (write/resume, handoff pattern) #254's Task Breakdown Notes (T-2/T-3/T-4) — a fresh-session resume dry-run and a write-twice idempotency check — but not persisted as a repo fixture (correct per D14: .pair/working/ is operational, excluded from KB-shipped content). See Detailed Comments for review of this gap.

Test Results

Test Suite: quality-gate (ts:check, test, lint, prettier:fix, mdlint:fix, hygiene:check, docs:staleness) — PASS
smoke-tests: PASS (all scenarios)
e2e (@pair/website): PASS (35/35)
Coverage: N/A — no executable code in this diff
Linting: Clean

Testing Strategy

• Happy Path: write mode with full session-known state → template-conformant file at .pair/working/checkpoints/<story-id>.md; resume mode against that file → correctly parsed 5-section state.
• Edge Cases: no story context (HALT), corrupted/incomplete checkpoint on resume (report + confirm, never guess), multiple checkpoints for one story (most-recent wins, duplicates flagged) — all documented in SKILL.md's Edge Cases section and exercised in the reported (not persisted) manual dry-run.
• Error Handling: explicit HALT/report instructions per edge case; no silent gap-filling.
• Performance: N/A — static Markdown/doc artifacts only.

Quality Assurance

Code Quality Checklist

• Content follows established KB authoring conventions (Check/Act/Skip/Verify step structure, consistent with sibling skills)
• Skill and template have appropriate documentation (frontmatter, Arguments table, Output Format, Notes, Graceful Degradation)
• Error handling implemented for edge cases (HALT rules, never-guess parsing)
• Security best practices followed — N/A, no code/inputs beyond local file paths
• Performance considerations addressed — N/A, no executable code
• No debugging code or console logs left behind (no executable code in this diff)

Review Areas

• Business Logic: Implementation matches all 4 ACs (see Story Context)
• Code Structure: Skill structure consistent with sibling capability skills
• Error Handling: N/A beyond documented HALT/edge-case rules (see above)
• Performance: N/A
• Security: N/A — no new inputs, endpoints, or dependencies
• Testing: Manual-testing gap flagged explicitly (see Detailed Comments) rather than presented as resolved

Deployment Information

Environment Impact

• Development: Ready — additive KB content, no build/runtime impact
• Staging: N/A — no deploy pipeline distinction for KB dataset content in this repo
• Production: N/A — ships as part of the next @pair/knowledge-hub package release
• Configuration: N/A — no env vars or config changed

Deployment Notes

• Database Migration: N/A
• Configuration Changes: N/A
• Feature Flags: N/A
• Dependencies: N/A — no package.json changes in this diff (verified: no dependency files touched)

Rollback Plan

Revert the PR commits. No migrations, no runtime state, no distributed defaults touched (.pair/working/ checkpoint files are per-project operational artifacts created only when the skill is invoked; nothing here is installed by default via install/update per D14).

Breaking Changes

API Breaking Changes

• Endpoint Changes: N/A
• Request/Response Format: N/A
• Authentication: N/A

Integration Breaking Changes

• Third-party Services: N/A
• Internal Services: N/A
• Client Applications: N/A

Migration Guide

N/A — purely additive; no existing skill's behavior changes (verified: /implement's SKILL.md has zero /checkpoint references today — composition is future-framed, landing with story #256).

Documentation

Documentation Updates

• README: N/A — only the templates catalog README.md under the KB dataset was updated (see Knowledge Sharing below)
• API Documentation: N/A
• User Documentation: Public skills catalog (apps/website/content/docs/reference/skills-catalog.mdx) updated with a new "State and Handoff Capabilities" section
• Technical Documentation: checkpoint-template.md + SKILL.md are themselves the technical documentation for this capability

Knowledge Sharing

• Technical Decisions: Template registered in templates/README.md catalog (table row + prose bullet)
• Learning Notes: Real in-branch gap found and fixed (see Detailed Comments): Template Notes initially lacked an explicit "not checkpoint state" marker, which is exactly the ambiguity a resume parse could stumble on — closed by commit e30c51f (disclaimer in template + explicit ignore-trailing-6th-section instruction in SKILL.md Step 7)
• Best Practices: Write-free ($persist=false) pattern documented as mirroring the /grill capability's return-vs-persist option (A8)

Performance Impact

Performance Metrics

• Load Time: N/A
• Response Time: N/A
• Memory Usage: N/A
• Database Performance: N/A

Benchmarking Results

N/A — no executable code, no runtime performance surface in this diff

Monitoring

• Metrics Added: N/A
• Alerts Configured: N/A
• Dashboards Updated: N/A

Security Considerations

Security Review

• Authentication: N/A
• Authorization: N/A
• Data Protection: N/A — checkpoint files may contain story/decision summaries but no secrets by design (skill instructions don't ask for or template any credential fields)
• Input Validation: N/A — no executable code parsing untrusted external input; parsing is LLM-instruction-driven over local repo files
• Dependency Security: N/A — no new dependencies

Security Testing

• Security Scan: N/A — no code paths to scan; pnpm quality-gate (lint/hygiene) passed
• Penetration Testing: N/A
• Compliance Check: N/A

Accessibility

Accessibility Compliance

• WCAG 2.1 AA: N/A — no UI changes beyond a new table row/section in an existing static docs page, same markup pattern as surrounding content
• Screen Reader: N/A
• Keyboard Navigation: N/A
• Color Contrast: N/A

Accessibility Testing

• Automated Testing: N/A
• Manual Testing: N/A
• User Testing: N/A

Risk Assessment

Technical Risks

Risk	Impact	Probability	Mitigation
Checkpoint too thin to resume reliably	High	Medium	Template mandates the five state sections; fresh-session dogfood test reportedly run (not persisted)
Divergence between file and issue-body mirror	Low	Medium	File is documented source of truth; mirror must be explicitly marked as a copy
Manual QA not persisted as a repo fixture	Low	Medium	Flagged explicitly in this review rather than treated as resolved; recommend checking DoD boxes with verification notes, or re-running with captured evidence, before merge

Business Risks

Risk	Impact	Probability	Mitigation
None identified specific to this PR	Low	Low	Purely additive KB capability; no user-facing runtime behavior changes yet (composition lands with story #256)

Reviewer Guide

Review Focus Areas

1. Business Logic Validation:

   • Verify Steps 1–5 (write) and 6–8 (resume) in SKILL.md map to AC1–AC4
   • Check the Edge Cases section against the issue's Edge Cases (no context, corrupted checkpoint, duplicates)

2. Code Quality Assessment:

   • Review the Check/Act/Skip/Verify step structure for consistency with sibling capability skills (e.g. grill, estimate)
   • Confirm the Template Notes disclaimer and Step 7's ignore-6th-section instruction are both present and consistent (see commit e30c51f)

3. Technical Implementation:

   • Confirm no dependency, architecture, or infra changes are hiding in this diff (there are none — verified via git diff --stat)
   • Confirm relative paths in SKILL.md (../../../.pair/...) resolve correctly given the file's location under packages/knowledge-hub/dataset/.skills/capability/checkpoint/

Testing the Changes

git checkout feature/#254-pair-capability-checkpoint
pnpm install
pnpm quality-gate
pnpm smoke-tests
pnpm --filter @pair/website e2e
# Manual: invoke the checkpoint skill in write mode for a sample story, then resume mode
# against the produced file in a separate session, to dogfood AC1/AC2/AC3.

Key Test Scenarios

1. Scenario 1: Write mode for a mid-implementation story with 2 of 4 tasks done → checkpoint file has all 5 sections populated correctly.
2. Scenario 2: Resume mode against that file in a zero-context session → parsed state matches exactly, no guessing on any field.
3. Scenario 3: Write mode invoked a second time for the same story → same file path, updated in place, no duplicate created.

Dependencies & Related Work

Blocking Dependencies

• PR Dependency: None — enabling primitive, no prerequisite stories per issue pair-capability-checkpoint — resumable state (write/resume, handoff pattern) #254
• Infrastructure: N/A
• Third-party: N/A

Related PRs

• Follows: Parent Epic Split implement: checkpoint + publish-pr via subagent #206 (Split implement: checkpoint + publish-pr)
• Blocks: None directly, but is a dependency for the future /implement closing-phase composition (pair-process-implement composes checkpoint + publish-pr via subagent (resume from checkpoint) #256) and a future /publish-pr handoff capability (same epic)
• Related: pair-process-implement composes checkpoint + publish-pr via subagent (resume from checkpoint) #256 (future /implement composition), future supervisor loop (Supervised automation — zero logic, consumes tags #212)

Follow-up Work

• Technical Debt: Manual QA (fresh-session resume test, idempotent-update check) reported as performed but not persisted as a repo fixture — tracked as an open item, see Detailed Comments and Risk Assessment
• Future Enhancements: /implement and /publish-pr composition wiring (separate stories)
• Monitoring: N/A

Stakeholder Communication

Stakeholder Notification

• Product Owner: N/A
• Business Stakeholders: N/A
• Customer Support: N/A
• Operations Team: N/A

Communication Plan

• Before Merge: Resolve or explicitly accept the DoD checklist gap (both QA checkboxes in issue pair-capability-checkpoint — resumable state (write/resume, handoff pattern) #254 remain unchecked despite reported manual verification)
• After Deployment: None required — no runtime behavior change until composition stories land
• Issue Response: N/A

[rucka]

Review Information

PR Number: #270
Author: Gianluca Carucci
Reviewer: pair-process-review (automated)
Review Date: 2026-07-07
Story/Epic: #254 (Story) — Parent Epic #206
Review Type: Feature (Documentation/KB capability skill, no executable code)
Estimated Review Time: 30 minutes

Review Summary

Overall Assessment

• Approved - Ready to merge
• Approved with Comments - Minor issues noted, can merge
• Request Changes - Issues must be addressed before merge
• Comment Only - Feedback provided, no blocking issues

Key Changes Summary

New checkpoint capability skill (write/resume progress state for context-reset handoffs), its backing template (5 state sections + authoring-only Template Notes appendix), catalog registrations (templates README + public skills-catalog.mdx, 33→34). Purely additive KB/docs content — no executable code, no dependency or architecture changes.

Business Value Validation

Delivers an enabling primitive (R2.10) for long-session context-reset recovery. No runtime composer wires it up yet (future stories #256 and a future /publish-pr) — this PR is scoped correctly to the atomic capability itself, per issue #254's stated boundaries.

Code Review Checklist

Functionality Review

• Requirements Met — AC1–AC4 all addressed: write mode (Steps 1–5) produces a template-conformant, zero-context-readable checkpoint; resume mode (Steps 6–8) parses and reports state; update-in-place is explicit (Core Rule + Step 4); write-free ($persist=false) return option is documented (Step 5, Composition Interface).
• Business Logic — Edge cases (no context, corrupted checkpoint, duplicates) are each documented with explicit resolution rules; "never guess" principle stated for malformed/missing sections.
• User Experience — N/A (agent-facing instructions, not end-user UI) beyond the new docs-site catalog entry, which reads consistently with sibling entries.
• Integration — /implement composition is correctly future-framed ("a future closing phase... story pair-process-implement composes checkpoint + publish-pr via subagent (resume from checkpoint) #256"); verified /implement's SKILL.md has zero /checkpoint references today (only an unrelated generic use of the word "checkpoint" at line 205) — the fix commit's claim holds up.
• Error Handling — HALT rules explicit for undetectable story context and missing checkpoint on resume; malformed-section handling explicit (report + confirm, no guessing).
• Performance — N/A, no executable code.

Code Quality Assessment

• Readability — Clear, consistent Check/Act/Skip/Verify step structure matching sibling capability skills (e.g. estimate, write-issue).
• Maintainability — Single-file skill + single-file template, no duplication.
• Reusability — Write-free option explicitly designed for reuse by future composers (documented parallel to the grill skill's A8 pattern).
• Naming — Consistent with catalog naming conventions (checkpoint, /pair-capability-checkpoint).
• Comments — N/A (Markdown instruction file, not code).
• Complexity — Reasonable; 8 algorithm steps split cleanly across two modes.

Technical Standards Compliance

• Style Guide — Passed pnpm quality-gate (includes mdlint:fix, prettier:fix, hygiene:check, docs:staleness).
• Architecture — No architectural pattern introduced; this is a leaf capability skill, consistent with the repo's process/capability skill taxonomy.
• Design Patterns — Follows the documented skill anatomy from writing-skills.mdx closely enough; deviations (no separate "HALT Conditions"/"Idempotent Re-invocation" top-level headers — folded into Edge Cases/Notes instead) match the actual practice of several sibling skills (estimate, assess-code-quality, manage-flags, etc.), not a real deviation from repo norms — see Minor Issues.
• Dependencies — None added; verified no package.json files touched in the diff.
• API Design — N/A.
• Database — N/A.

Security Review

Security Checklist

All items N/A — no code paths, no new inputs beyond local file/git reads, no dependencies, no secrets referenced or templated.

Security Concerns

None identified.

Testing Review

Test Coverage Assessment

• Unit Tests — N/A, no executable code (correctly noted in the story's own Testing Strategy per task).
• Integration Tests — N/A.
• End-to-End Tests — pnpm --filter @pair/website e2e: 35/35 passing, covers the docs-site catalog page touched by this PR.
• Edge Cases — Documented in SKILL.md's Edge Cases section (no context / corrupted / duplicate checkpoints).
• Error Scenarios — Same as above; documentation-only, no automated harness exists for KB-authored skills in this repo (consistent with prior similar stories).
• Performance Tests — N/A.

Test Quality Review

N/A — no test code in this diff.

Testing Feedback

quality-gate (ts:check, test, lint, prettier:fix, mdlint:fix, hygiene:check, docs:staleness): PASS
smoke-tests: PASS (all scenarios)
e2e (@pair/website): PASS (35/35)
Test Results: ✅ All Passing

Open gap (not resolved by this review, reported as-is): issue #254's Definition of Done checklist still shows both QA checkboxes unchecked — "Fresh-session resume test... (dogfood)" and "Idempotent update verified (write twice, one file)" — while the Task Breakdown's own Notes (T-2, T-3, T-4) state both were performed manually by the implementer in a scratch/ad-hoc session. Per D14, .pair/working/ operational files are excluded from KB-shipped content, so there's no natural committed fixture for either check — the "not persisted" state is correct per that decision, but it also means there is no repo-visible evidence for an independent reviewer to inspect. This is a real, honest gap: verified manual testing exists only by the implementer's self-report, and the DoD checklist itself remains unchecked. Recommend the story be closed only after either (a) checking those two boxes with a note on how/when verified, or (b) re-running and capturing a redacted/sample transcript as evidence.

Performance Review

N/A — no executable code, no runtime performance surface.

Documentation Review

Documentation Checklist

• Technical Documentation — SKILL.md + checkpoint-template.md are themselves the primary technical documentation.
• User Documentation — skills-catalog.mdx updated with new "State and Handoff Capabilities" section, skill count and "Last updated" date bumped correctly.
• Change Log — N/A, this repo doesn't use a CHANGELOG for KB content in this area (changesets are for package releases; this PR touches no released package version).

Documentation Quality

• Accuracy — Catalog entry description matches SKILL.md frontmatter description in substance.
• Completeness — Template registered in both the internal templates catalog and the public skills catalog.
• Up-to-date — Skill count bump (33→34) and date bump verified correct against the diff.

Detailed Review Comments

Positive Feedback

What's Done Well:

• The branch caught and fixed a real spec/implementation mismatch within itself, before this review: the original Template Notes section (commit dd7c775) had no marker excluding it from parsed checkpoint state, which would have made a literal reading of Step 7 ("parse the five sections in order") flag it as an unexpected 6th section on resume. The fix commit e30c51f closed this correctly on both sides — the template got an explicit "omit from rendered checkpoints" disclaimer, and Step 7 got a matching "ignore a trailing Template Notes (or any 6th) section" instruction. Verified both halves are present and consistent in the current diff.
• The same fix commit correctly walked back present-tense composition language ("When composed by /implement") to future-framed language ("a future closing phase of /implement (story pair-process-implement composes checkpoint + publish-pr via subagent (resume from checkpoint) #256)"), and I independently verified /implement's SKILL.md has zero /checkpoint references today — the claim is accurate, not just asserted.
• The write-free ($persist=false) option is a deliberate, explicitly-documented reuse of the /grill capability's return-vs-persist pattern (A8) rather than an ad hoc addition — good consistency with existing conventions.
• Edge-case handling (no context, corrupted checkpoint, duplicates) is specific and cross-referenced back to the exact algorithm steps that implement each one, not just restated in prose.

Issues to Address

Critical Issues ⚠️

None.

Major Issues 🔍

None.

Minor Issues 💡

Consider addressing:

• Issue pair-capability-checkpoint — resumable state (write/resume, handoff pattern) #254 DoD checklist — Both QA checkboxes (fresh-session resume test, idempotent-update check) remain unchecked despite the Task Breakdown Notes describing both as performed. Not a code issue, but a documentation-consistency gap between the issue and the reported work. See Testing Review above for full detail — reporting only, not fixing.
• SKILL.md structure — No dedicated "HALT Conditions" or "Idempotent Re-invocation" top-level sections (the writing-skills.mdx anatomy example shows both as separate headers); this skill folds HALT rules into Step 1/Edge Cases and idempotency into the Notes section instead. This matches actual practice in several sibling skills (estimate, assess-code-quality, manage-flags, record-decision, verify-*, write-issue... wait, write-issue does have its own "HALT Conditions" header, so practice is mixed) — low-severity stylistic inconsistency, not a functional problem, pre-existing pattern variance across the skill catalog rather than something this PR introduces new.
• No committed sample/fixture checkpoint — There is no example checkpoint file anywhere in the repo (understandably, per D14 — .pair/working/ is operational and excluded from KB defaults) that a reviewer or new contributor could look at to sanity-check the template's real-world shape. Purely a nice-to-have; not blocking given the explicit D14 rationale.

Questions ❓

• None outstanding — the design rationale (write-free option, file-as-source-of-truth, D14 exclusion of .pair/working/) is documented clearly enough in-file that no clarification is needed from the author.

Risk Assessment

Technical Risks

Risk	Impact	Probability	Mitigation
Checkpoint format proves too thin in real dogfooding once /implement composition (#256) actually lands	Medium	Medium	Format is documented as a KB convention, easy to revise; no downstream consumers depend on it yet
Manual QA (resume/idempotency) not independently verifiable from the repo	Low	Medium	Self-reported only; recommend the DoD-checklist follow-up noted above before the story is marked Done

Business Risks

Risk	Impact	Probability	Mitigation
None specific to this PR	Low	Low	Purely additive capability; no user-facing behavior changes until composition stories land

Tech Debt Assessment

No new tech debt introduced by this diff itself. The one open item — manual QA reported but not persisted as a repo fixture — is a transparency gap rather than debt in the codebase; it's explicitly acknowledged in the issue's own Task Breakdown Notes (T-2/T-3/T-4) as correct-per-D14 rather than a shortcut, and the DoD checklist inconsistency is a process follow-up, not a code quality issue.

Adoption Compliance

Area	Status	Notes
Tech stack (dependencies)	CONFORMANT	No package.json changes anywhere in the diff; no new dependencies.
Architecture / ADR	CONFORMANT	No architectural decision introduced by this diff; the skill follows the existing capability-skill pattern without deviation. No new ADR required.
Non-architectural decisions (ADL)	CONFORMANT (with observation)	D8 and D14, referenced in issue #254 as the basis for this design, do not appear to have their own dedicated ADR/ADL entries in .pair/adoption/decision-log/ or .pair/adoption/tech/adr/ as of this branch — but this predates and is out of scope for this PR (those decisions originate from backlog triage, not from work done in this diff). Not a blocker for this PR; flagged for awareness only.
Security	CONFORMANT	No new inputs, secrets, or dependencies; nothing to assess beyond the standard checklist (all N/A).
Coding standards	CONFORMANT	Passed pnpm quality-gate in full (ts:check, test, lint, prettier:fix, mdlint:fix, hygiene:check, docs:staleness); skill structure consistent with sibling capability skills.
Infrastructure	CONFORMANT	No infra, CI, or deployment config changes.

Definition of Done Cross-Check (issue #254)

• AC1 (write mode, zero-context readable) — met (Steps 1–5 + template).
• AC2 (resume mode, parsed state returned) — met (Steps 6–8).
• AC3 (update-in-place, one file per story) — met (Core Rule + Step 4).
• AC4 (write-free handoff return) — met (Step 5, $persist=false).
• DoD "All acceptance criteria implemented and verified" — implemented: yes; "verified" independently of implementer self-report: partially (see Testing Review).
• DoD "Skill follows authoring conventions" — met, with the minor structural note above.
• DoD "Code review completed and approved" — this review.
• DoD "Documentation updated — docs site page" — met, verified in diff.
• DoD "CLI unaffected" — met, verified (no apps/pair-cli files touched).
• DoD QA: "Fresh-session resume test (dogfood)" — checklist item unchecked in the issue; reportedly performed but not repo-verifiable. Not currently satisfied per the issue's own tracking.
• DoD QA: "Idempotent update verified (write twice, one file)" — same status as above. Not currently satisfied per the issue's own tracking.
• Task Breakdown checklist (T1–T4) — all four also remain unchecked in the issue body's Checklist section, despite the accompanying Detailed Tasks section describing all four as complete with no open functional gaps.

Decision

APPROVED WITH COMMENTS / TECH-DEBT-TRACKED — no critical or major issues, no security holes, no missing ADR, all quality gates and both requested test suites pass. The one open item (DoD checklist boxes unchecked / manual QA not repo-verifiable) is a process/transparency gap already self-disclosed in the issue's own Task Breakdown Notes, not a code defect — recommend resolving it (check the boxes with verification notes, or re-run with captured evidence) before the story itself is marked Done, but it does not block merging this PR.

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Attempted self-approval via gh pr review --approve: fails with "cannot approve your own pull request" — expected GitHub limitation for PRs authored by the same account running the review, not an error.