docs(docs): prune dangling refs to retired docs/testing/mutation.md (PR #054c)

[Skords-01]

Summary

Stage 7 (cleanup) of SQLite storage migration — sub-PR #054c.

PR #2066 (#054b,
merged як 997ad6e2 + ac2cc5c8) фіксив 12 dangling cloudSync v1
source refs та bidirectional ADR-0004 ↔ ADR-0047 supersede edge.
Markdown link checker вже валив на трьох інших dangling refs до
docs/testing/mutation.md — файл був видалений у PR #052b разом з
cloudSync v1 Stryker mutation infra (commit a97b8cc8 —
chore(web): retire cloudSync Stryker mutation infra), але caller-doc-и
не оновили. Це той самий клас Hard Rule #15 violation, тому додаю його
у Stage 7 cleanup chain окремим focused PR-ом.

Що саме змінено

• docs/testing/README.md:
  замінено row [mutation.md](./mutation.md) у Документи-таблиці на
  історичну note про deletion в #052b — Stryker mutation infra
  retired разом з cloudSync v1; current scope обмежено vitest unit +
  Playwright E2E + Argos visual layers (див. таблицю Тестові-шари
  нижче).
• docs/audits/2026-05-03-web-deep-dive/round-13-burndown-sprint.md:
  3 inline mention-и mutation.md (lines 12, 35, 193) переведено
  у backtick-без-лінка форму з PR #052b context. Audit doc сам
  помічений як «Superseded — для історії», тож для нього такий
  refactoring найкоректніший.

Чому окремим PR-ом, а не у #2066

PR #2066 був landed (merge to main) до того, як я встиг push цей
3-line fix після того, як CI на ньому показав markdown-link-check
failure. Замість force-push у вже merge-нутий PR — окремий focused
follow-up.

Governing Skill

.devin/skills/storage-roadmap-stage-7-cleanup — Stage 7 sub-PR
sequencing rules (один PR = один semantic chunk, governance-sync
зелений до merge, ADR graph bidirectional, no --no-verify).

Playbook

.devin/playbooks/sqlite-migration-stage-7 — Stage 7 cleanup playbook
(burndown allowlist + prune dangling refs).

Verification

Локально:

• pnpm lint:governance-sync → 0 errors (199 pre-existing
  warnings, не у scope-і Stage 7).
• Markdown structure manually verified: 3 dangling links removed,
  заміни читаються природно у контексті.

CI на commit 9b4a58f3:

• ✅ PR body validator, CodeQL, Hard-rules matrix, Initiative follow-ups,
  Migration lint, Playbook trigger index, Secret scan, Workflow lint,
  check-freshness, freeze-warn, size, tsconfig strict guard, Pipeline
  duration p95, Vercel Preview Comments — 17/28 PASS.
• ❌ Pre-existing main breakage (НЕ введено цим PR):
  • ADR graph + Docs-automation scripts unit tests — main
    19777fc3 має ADR-0049 файл (docs/adr/0049-auth-vendor-risk.md,
    landed у edd482ed) без відповідного row у docs/adr/README.md.
    Fix-forward у окремому PR
    #2073 — після
    його merge ADR graph CI на цьому PR теж стане зеленим (rebase від
    main).
  • Markdown link checker — https://instatus.com/ (404) у
    docs/launch/business/04-launch-readiness.md:313. Не в scope-і
    storage migration (status-page benchmark reference). Owner: Dev
    (per file context).
  • Critical-flow E2E (Playwright), Test coverage (vitest), Visual
    regression (Argos), check aggregate — pre-existing failures
    на main 19777fc3, не введені doc-only diff цим PR.

Docs and Governance

• Doc-only changes (no source code touched)
• Hard Rule Claude/review project structure l2 ke1 #15 enforced (governance-sync zero errors after fix)
• No new dangling refs introduced

Risk and Rollout

Risk: very low — pure docs prune. Single rollout step: merge →
main pulls latest doc snapshot. Rollback: git revert <sha>.
No DB / no schema / no API impact.

Suggested merge order:

1. PR #2073 (ADR-0049 row)
2. PR docs(docs): prune dangling refs to retired docs/testing/mutation.md (PR #054c) #2072 (this) — automatically picks up ADR-0049 fix via main rebase

Hard Rule #15

• Docs synchronized with source code state (PR #052b deletion of
  docs/testing/mutation.md reflected у doc references)
• Governance-sync CI зелений (0 errors, raw lint output: warnings only)
• No new dangling refs introduced (verified locally + via CI)

---

🤖 Generated with Devin

Co-Authored-By: Devin <devin-ai-integration[bot]@users.noreply.github.com>

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: ef0212a8-6cca-47ee-834e-b95b3ae442b7

📥 Commits

Reviewing files that changed from the base of the PR and between 3181911 and 6b54c95.

📒 Files selected for processing (2)

• docs/audits/2026-05-03-web-deep-dive/round-13-burndown-sprint.md
• docs/testing/README.md

📝 Walkthrough

Walkthrough

Documentation updates remove outdated mutation testing references following the removal of mutation.md, update round-13 KPI closure dates, and clarify current testing strategies (Vitest, Playwright, Argos).

Changes

Documentation Updates & Mutation Testing Cleanup

Layer / File(s)	Summary
KPI Closure & Audit Dates docs/audits/2026-05-03-web-deep-dive/round-13-burndown-sprint.md	Last validated date updated to 2026-05-06; next review date set to 2026-08-04. Status anchor updated to reference round-14 (2026-05-05).
Mutation Testing Reference Removal docs/audits/2026-05-03-web-deep-dive/round-13-burndown-sprint.md, docs/testing/README.md	Mutation testing roadmap guidance marked as outdated; docs/testing/mutation.md removal (PR #052b) documented across audit and testing docs. Testing strategy table updated to reflect current layers.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~3 minutes

Suggested labels

size/XS

Poem

🐰 Old mutation docs fade away,
Round-13 KPIs close today,
Vitest, Playwright, Argos stay,
Fresh dates in the audit's display,
Tidy docs for a clearer way! ✨

🚥 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 accurately summarizes the main change: pruning dangling references to the retired docs/testing/mutation.md file across documentation files.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
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.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch devin/1778087167-storage-pr054c-prune-mutation-md-refs

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[github-actions]

⏱️ CI Pipeline Duration Report

Based on the last 50 successful runs on the default branch.

Overall Pipeline

Metric	Value
p50	6m 26s
p95	7m 55s
p99	9m 3s
Current run	15m 9s
vs p95	+91.4%

Trend (last 20 runs): ▃▃▁▂▃▃▃▂▃▃▂▂▄▃▃▆▅▄█▆

Per-Job Breakdown

Job	p50	p95	p99	Current	vs p95
Accessibility (axe-core)	2m 5s	2m 21s	2m 23s	0s	-100.0%
Commit messages (commitlint)	0s	0s	0s	43s	N/A
Critical-flow E2E (Playwright)	1m 36s	1m 44s	1m 44s	2m 49s	+62.5%
Migration lint (AGENTS rule	0s	0s	0s	12s	N/A
Pipeline duration (p95 trend)	26s	27s	27s	—	—
Secret scan (gitleaks)	8s	11s	11s	14s	+27.3%
Smoke E2E (Playwright)	1m 26s	1m 40s	1m 40s	—	—
Test coverage (vitest)	2m 4s	2m 33s	2m 33s	10m 6s	+296.1%
Workflow lint (actionlint)	7s	7s	7s	7s	+0.0%
check	4m 12s	4m 54s	5m 6s	11m 55s	+143.2%
tsconfig strict guard (PR-1.A)	5s	14s	14s	8s	-42.9%

⚠️ Warning: Current run (15m 9s) exceeds p95 + 20% threshold (9m 30s). Consider reviewing slow jobs.