docs: remove deleted project docs skill requirement

.project-docs/30-worklog/tasks/20260908-remove-maintain-project-docs-requirement-6d8a31f2.md

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+# Task: Remove the deleted project-document Skill requirement
+
+## Identity
+
+- Task ID: 20260908-remove-maintain-project-docs-requirement-6d8a31f2
+- Mode: Integration
+- Branch: main
+- Worktree: /Users/inmanx/Documents/lwltAPI
+- Base commit: 515b545b32fcbb30311b56c5b90a36f3d3834d95
+- Owner: codex
+- Status: Completed
+
+## Scope
+
+- Remove repository requirements for the deleted `maintain-project-docs` Skill and its `task_context.py` or Skill-owned validation commands.
+- Keep `.project-docs/` as repository-local project memory and replace external ownership mechanics with self-contained Git worktree checks.
+
+## Intent And Constraints
+
+- Preserve the user's pre-existing untracked task record and all unrelated worktree state.
+- Do not rewrite historical task records that accurately describe the workflow used at that time.
+- Do not change product behavior, release artifacts, schemas, mappings, or runtime code.
+
+## Outcome
+
+- Removed every active startup, ownership, validation, and completion requirement tied to the deleted `maintain-project-docs` Skill, `task_context.py`, or Skill-owned validation scripts.
+- Replaced the external ownership/lock workflow with repository-local Git branch, worktree, status, base-commit, and overlap checks.
+- Kept `.project-docs/` as the canonical project-memory location and preserved its task-record and Integration review boundaries.
+- Renamed the repository-hygiene test so it describes the project-memory invariant without naming the deleted Skill.
+- Removed the two exact `.DS_Store` residue files reported by repository hygiene checks; no unrelated source or task record was changed.
+
+## Verification
+
+- `git diff --check`: passed before the final task-record update.
+- `node --run check:repo`: passed, 10/10.
+- `node --run check`: passed.
+- `node --run test:control-plane`: passed.
+- `node --run test:legacy`: passed, 273/273.
+- `node --run build`: passed.
+- Active-reference scan confirmed remaining old command names occur only in historical task/reflection records or in explicit statements that they are not required.
+
+## Follow-ups
+
+- None recorded.
+
+## Promotion Candidates
+
+- None recorded; this task directly updates the repository-wide governance requested by the user.