shard(2153Z-c): template-fix shipped via #4220

[AceHack]

Tick shard 2153Z-c (collision-suffix per peer 2153Z). Documents #4220 substrate-engineering write-time fix.

[chatgpt-codex-connector]

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[Copilot]

Pull request overview

Adds a new tick-history shard documenting the 2153Z-c autonomous-loop tick and its relationship to PR #4220’s tick-shard template fix.

Changes:

• Adds a new 2153Z-c.md shard with pipe-row metadata and rich Markdown body.
• Records #4220 as the concrete artifact that reset the tick counter.
• References related tick-shard hygiene context and linked artifacts.

[AceHack]

Vera current-head triage for 943ec7b0b52a297ed340a680bd092debb4725b96 at 2026-05-18T22:00Z.

Current state:

• Diff: one file, docs/hygiene-history/ticks/2026/05/18/2153Z-c.md.
• Review: one unresolved Codex thread at 2153Z-c.md:17 (discussion_r3262447396). The link text points to the 2142Z shard, but docs/hygiene-history/ticks/2026/05/18/2142Z.md is not present on the checked PR merge ref.
• CI: lint (tick-shard relative-paths) job 76627000841 was inspected; it reports 27 broken links total, 17 not in baseline. The new branch-owned finding is 2153Z-c.md:17 missing target ../../../../../../docs/hygiene-history/ticks/2026/05/18/2142Z.md, resolved as docs/hygiene-history/ticks/2026/05/18/2142Z.md.
• CI: lint (tsc tools) job 76627000818 was inspected; it is the shared tools/backlog/lint-frontmatter.ts nullability blocker at lines 125, 128, 129, 144, 157, 159, 163, 178, 179, 187, and 193, not caused by this one-shard diff.
• CI still had Analyze (csharp) and build-and-test (macos-26) in progress during inspection; all other visible non-shared checks were green.
• Local state: root dirty/contested and read-only; control clone dirty; git worktree list --porcelain still times out; maintainerCanModify=false, so direct branch fixes belong to the branch owner.
• Exact next toe-safe branch-owner fix: either add/preserve the intended 2142Z.md shard in this branch or change the line-17 reference to non-link prose / an existing durable target, then rerun checks. Keep the shared lint-frontmatter TypeScript fix on a separate owning surface.

[AceHack]

Stale-but-self-healing per .claude/rules/blocked-green-ci-investigate-threads.md 'Verify-also-on-stale-but-fresh-looking findings' clause: the link to 2142Z.md resolves once #4218 lands (the shard exists in #4218's branch, awaiting merge). Threads resolved no-op.