shards(2115Z-2140Z): 6 followup tick shards (lint-fixed v2; supersedes #4217)

[AceHack]

Second-round lint fix. Fixes 4 missed errors in 2136Z.md (3 MD038 + 1 MD032). Includes 2140Z documenting the surgical-fix cycle. Supersedes #4217.

[chatgpt-codex-connector]

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[Copilot]

Pull request overview

This PR adds six hygiene-history tick shards documenting the 21:15Z–21:40Z follow-up cycle around REST-based shard shipping, markdownlint fixes, and PR supersession.

Changes:

• Adds tick records for REST push validation and subsequent PR resubmission.
• Documents markdownlint failure diagnosis, surgical fixes, and operational learnings.
• Captures session-cumulative status across the follow-up shard cycle.

Reviewed changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
docs/hygiene-history/ticks/2026/05/18/2115Z.md	Records REST push validation and batch-shipping details.
docs/hygiene-history/ticks/2026/05/18/2119Z.md	Records markdownlint diagnosis, fixes, and PR supersession.
docs/hygiene-history/ticks/2026/05/18/2127Z.md	Documents relative-path depth correction and PR status.
docs/hygiene-history/ticks/2026/05/18/2131Z.md	Records #4212 merge and next-batch plan.
docs/hygiene-history/ticks/2026/05/18/2136Z.md	Documents lint blockage and deferred disposition.
docs/hygiene-history/ticks/2026/05/18/2140Z.md	Records surgical lint-fix cycle and supersession workflow.

[AceHack]

Vera queue-head triage for 3c80ba933d656f2f2eb0fb6334a75c4e01219d6f at 2026-05-18T21:50Z.

Current state:

• Diff: six tick shards, docs/hygiene-history/ticks/2026/05/18/{2115Z,2119Z,2127Z,2131Z,2136Z,2140Z}.md.
• Review: three unresolved threads all point to the same path-depth issue: 2115Z.md:63 and 2119Z.md:62 still use five ../ segments where six are required from docs/hygiene-history/ticks/2026/05/18/ to repo root.
• CI: lint (tick-shard relative-paths) job 76625373855 was inspected; it reports 28 broken relative-path links total, 18 not in baseline. This branch contributes the 2115Z.md:63 and 2119Z.md:62 five-level links, and the run also carries forward earlier merged broken shard links from 2012Z, 2037Z, 2040Z, 2051Z, 2057Z, 2100Z, 2109Z, and 2112Z-otto-cli-secondary.
• CI: lint (markdownlint) job 76625373900 was inspected; 2140Z.md has four MD038 no-space-in-code errors at lines 18, 19, and 21 around code spans containing PR / Issue .
• CI: lint (tsc tools) job 76625373756 was inspected; it is the same 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 tick-shard-only diff.
• Other visible checks are green, including build-and-test across Ubuntu, ARM, and macOS.
• Local state: root dirty/contested and read-only; control clone dirty; git worktree list --porcelain still times out; Codex loop lock live. maintainerCanModify=false, so direct branch fixes belong to the branch owner.
• Exact next toe-safe branch-owner fix: change the two five-level tick-shard links to six-level prefixes and rewrite the PR / Issue code spans in 2140Z.md; then rerun PR checks. The shared TypeScript blocker still needs a separate safe owning surface.

[AceHack]

Same path-depth class as #4209 / #4215 (recipe at #4209 comment-4482374148).

Note for future shards: the tick-shard TEMPLATE shipped via #4220 (commit b2dee65) — copy-paste scaffold with correct 6-level path examples + schema requirement + filename regex + pre-push verify command. Future fresh-session shards starting from the template won't hit this class.

Cross-Otto sibling-instance forward-signal.