fix(hygiene): clear 2026-05-18 tick-link drift

[AceHack]

What changed

• Fixes 15 repo-relative links in 2026-05-18 tick shards by correcting path depth from five .. segments to six where needed.
• Converts one user-scope memory path that points outside repo-canonical history from a markdown link into plain code text.
• Releases the claim task-fix-20260518-tick-shard-links in the same branch history.

Why

Adjacent archive/research PRs (#4306, #4308, #4309 and siblings) were all failing lint (tick-shard relative-paths) on the same shared 2026-05-18 hygiene-history debt, not on their branch payloads.

Verification

• bun tools/hygiene/audit-tick-shard-relative-paths.ts --enforce --baseline tools/hygiene/audit-tick-shard-relative-paths.baseline.json
• git diff --check

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[Copilot]

Pull request overview

This PR fixes broken repo-relative links in 2026-05-18 hygiene tick shards by correcting path depth to reach the repository root and avoiding a non-repo-canonical user-scope memory link.

Changes:

• Updates .claude/rules and docs/backlog relative links from five to six .. segments where needed.
• Converts one out-of-repo user-scope memory reference from a markdown link to plain code text.
• Keeps the hygiene-history archival content intact while making link-audit enforcement pass for these touched shards.

Reviewed changes

Copilot reviewed 9 out of 9 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
docs/hygiene-history/ticks/2026/05/18/2012Z.md	Corrects repo-root-relative rule and backlog links.
docs/hygiene-history/ticks/2026/05/18/2029Z.md	Removes an invalid markdown link to user-scope memory outside repo history.
docs/hygiene-history/ticks/2026/05/18/2037Z.md	Corrects stale-armed-PR rule link depth.
docs/hygiene-history/ticks/2026/05/18/2040Z.md	Corrects backlog and rule link depths.
docs/hygiene-history/ticks/2026/05/18/2051Z.md	Corrects blocked-green-CI rule link depths.
docs/hygiene-history/ticks/2026/05/18/2057Z.md	Corrects rule links used in operational guidance.
docs/hygiene-history/ticks/2026/05/18/2100Z.md	Corrects refresh-world-model rule link depth.
docs/hygiene-history/ticks/2026/05/18/2109Z.md	Corrects bounded-wait rule link depth.
docs/hygiene-history/ticks/2026/05/18/2112Z-otto-cli-secondary.md	Corrects claim-coordination rule link depth.