docs(devlog): record train 4 bug-hardening outcome

[lidge-jun]

Summary

Docs only. This records the final evidence ledger for the release train 4 bug-hardening lane in devlog/_plan/260927_release_train_4/bug-hardening/050_disposition_and_ci.md: the merged SHAs for #6099 and #6113, the batch integration path, verification per slice, the held-PR and issue dispositions with comment links, remaining risk, and the files that overlap other lanes. No source, test or structure file changes.

Verification

• bun run privacy:scan on this exact commit: exit 0. It reads tracked devlog content, which is the only thing this PR changes.
• bun test tests/ci-workflows/file-size-ratchet.test.ts tests/ci-workflows/repo-hygiene.test.ts: 24 pass, 0 fail.
• Nothing in the build, typecheck or test path reads devlog/, so no other gate applies. Per the train coordinator's final rule, Cross-platform CI runs once on final dev.

Checklist

• Scope stays focused and avoids unrelated cleanup.
• Docs or release notes were updated when needed.
• Security-sensitive changes were reviewed for secrets, auth, and unsafe defaults. (The ledger names only fixes already merged, so it discloses no pre-fix weakness.)

[chatgpt-codex-connector]

Codex Review Summary

This comment shows the latest Codex review activity on this pull request.

Review	Status	Commit	Review trigger
📝 Code Review	✅ Completed 2026-09-27T19:45:58.451372Z	251cb89	PR opened

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[github-actions]

✅ Deterministic PR hygiene checks passed.

[lidge-jun]

Maintainer integration into dev (MAINTAINERS.md dev-only exception) of a docs-only devlog ledger under the train coordinator final merge rule. Local checks on exact head: privacy:scan exit 0, ratchet and repo-hygiene tests 24 pass. No new dev commit touches this file.

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📒 Files selected for processing (1)

• devlog/_plan/260927_release_train_4/bug-hardening/050_disposition_and_ci.md

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