docs: add docs maintainer checklist

[flyingrobots]

Summary

• add a canonical docs maintainer checklist for doc-heavy branches
• land TR-006 and archive the consumed backlog card
• wire the checklist into tracked doctrine and Truth planning indexes

Verification

• npx prettier --check CHANGELOG.md CONTRIBUTING.md WORKFLOW.md docs/DOCS_CHECKLIST.md docs/BACKLOG/README.md docs/archive/BACKLOG/README.md docs/archive/BACKLOG/TR-006-docs-maintainer-checklist.md docs/design/README.md docs/design/TR-006-docs-maintainer-checklist.md docs/legends/TR-truth.md
• git diff --check
• pre-commit eslint
• pre-push eslint
• npm test

Summary by CodeRabbit

Release Notes

• Documentation
  • Added a maintainer checklist for documentation-heavy pull requests, covering boundary clarity, canonical-source references, index hygiene, and empty-state wording standards
  • Updated contributor guidelines with a pre-review checklist step for doc-heavy branches
  • Added workflow guidance requiring the documentation checklist to run before review

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: f9bc25b1-af95-4419-8884-c2770b0aa626

📥 Commits

Reviewing files that changed from the base of the PR and between 60b9dd0 and 475470e.

📒 Files selected for processing (10)

• CHANGELOG.md
• CONTRIBUTING.md
• WORKFLOW.md
• docs/BACKLOG/README.md
• docs/DOCS_CHECKLIST.md
• docs/archive/BACKLOG/README.md
• docs/archive/BACKLOG/TR-006-docs-maintainer-checklist.md
• docs/design/README.md
• docs/design/TR-006-docs-maintainer-checklist.md
• docs/legends/TR-truth.md

💤 Files with no reviewable changes (1)

• docs/BACKLOG/README.md

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📝 Walkthrough

Walkthrough

This pull request introduces a documentation maintainer checklist feature. A new file docs/DOCS_CHECKLIST.md provides pre-review guidelines for doc-heavy pull requests. The item transitions from backlog to completed status, with supporting design documentation and integrated references in contributor workflows.

Changes

Cohort / File(s)	Summary
New Checklist Documentation docs/DOCS_CHECKLIST.md, docs/design/TR-006-docs-maintainer-checklist.md	Adds the maintainer checklist with coverage of boundary clarity, canonical-source linking, cross-doc discoverability, index hygiene, and empty-state wording. Design document records cycle status, decisions, implementation outline, and retrospective.
Doctrine Integration CONTRIBUTING.md, WORKFLOW.md, CHANGELOG.md	Incorporates the new checklist into contributor guidance and workflow rules; documents the feature in changelog under "Added" section.
Index & Legend Updates docs/design/README.md, docs/legends/TR-truth.md, docs/BACKLOG/README.md, docs/archive/BACKLOG/README.md	Moves TR-006 from backlog to landed status; updates Truth legend to reflect completed design document and refocuses related work bullets on documentation hygiene and cross-link discoverability.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

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🐰 A checklist hops in, so neat and so long,
For docs that are healthy, coherent, and strong!
No more stray boundaries, no orphaned links lost,
Just maintainers running pre-review like a boss! ✨

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'docs: add docs maintainer checklist' directly and clearly summarizes the main change—introducing a new documentation checklist for maintainers, which is the core objective of the PR.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ 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 docs/tr-006-docs-maintainer-checklist

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