docs: remove v3-era planning docs and shipped simplify-v5 checklist

[kridaydave]

Problem

v5.0.0 is merged, tagged, and published, but the repo still carries v3-era work artifacts: the V3.4.2 phase plans, the content-organization plan (its feature shipped in v3.5 and was rebuilt in v5), and the root TODOs.md churn checklist whose own last instruction is to be deleted when v5 ships.

Fix

Delete docs/implementation/, docs/implementation plan/, docs/CONTENT_BASED_ORGANIZATION_PLAN.md, and TODOs.md. Per AGENTS.md, a merged PR is the implementation record — no second checklist stays in the repo. No source, tests, or tool shapes are touched; the only inbound references are historical CHANGELOG entries, which are left alone.

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Done with ZCode (GLM, agy harness).

Summary by CodeRabbit

• Documentation
  • Removed outdated implementation plans, refactoring proposals, and organization strategy documents.
  • Removed documentation describing planned history logging, system organization, smart suggestions, and integration work.
  • No application functionality or public code interfaces were changed.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Team

Run ID: 6efcb059-1392-4907-981c-d3a2da2d775d

📥 Commits

Reviewing files that changed from the base of the PR and between 8919a40 and b77a59b.

📒 Files selected for processing (9)

• TODOs.md
• docs/CONTENT_BASED_ORGANIZATION_PLAN.md
• docs/implementation plan/CODEBASE_REFACTORING_PLAN_V3.4.2.html
• docs/implementation plan/CODEBASE_REFACTORING_PLAN_V3.4.2.md
• docs/implementation/IMPLEMENTATION_PLAN_V3.4.2_MASTER.md
• docs/implementation/PHASE_1_HISTORY_LOGGING.md
• docs/implementation/PHASE_2_SYSTEM_ORGANIZE.md
• docs/implementation/PHASE_3_SMART_SUGGEST.md
• docs/implementation/PHASE_4_INTEGRATION.md

💤 Files with no reviewable changes (9)

• docs/implementation/PHASE_4_INTEGRATION.md
• TODOs.md
• docs/implementation plan/CODEBASE_REFACTORING_PLAN_V3.4.2.md
• docs/implementation/IMPLEMENTATION_PLAN_V3.4.2_MASTER.md
• docs/CONTENT_BASED_ORGANIZATION_PLAN.md
• docs/implementation/PHASE_2_SYSTEM_ORGANIZE.md
• docs/implementation plan/CODEBASE_REFACTORING_PLAN_V3.4.2.html
• docs/implementation/PHASE_3_SMART_SUGGEST.md
• docs/implementation/PHASE_1_HISTORY_LOGGING.md

Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review.

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📝 Walkthrough

Walkthrough

The pull request deletes obsolete planning and status documents. It does not alter source code or exported program entities.

Changes

Documentation cleanup

Layer / File(s)

Summary

Remove obsolete planning documents TODOs.md, docs/CONTENT_BASED_ORGANIZATION_PLAN.md, docs/implementation plan/CODEBASE_REFACTORING_PLAN_V3.4.2.html, docs/implementation plan/CODEBASE_REFACTORING_PLAN_V3.4.2.md, docs/implementation/IMPLEMENTATION_PLAN_V3.4.2_MASTER.md, docs/implementation/PHASE_1_HISTORY_LOGGING.md, docs/implementation/PHASE_2_SYSTEM_ORGANIZE.md, docs/implementation/PHASE_3_SMART_SUGGEST.md, docs/implementation/PHASE_4_INTEGRATION.md

The obsolete TODO list, implementation plans, refactoring report, and content-organization plan were deleted.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Merge Risk: ⚪ Minimal · up to b77a5

This change removes obsolete planning and checklist documentation without modifying source code, tests, or runtime behavior; no actionable merge-blocking risk remains beyond normal checks and review.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately summarizes the deletion of obsolete v3-era planning documents and the shipped simplify-v5 checklist.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0…
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

Full details: Docstring Coverage

Explanation

No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/remove-stale-docs

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