docs: remove deleted project docs skill requirement

.project-docs/05-agent-entry/read-before-planning.md

@@ -2,13 +2,13 @@
 
 Before writing any coding plan, follow this order:
 
-1. Run the Concurrent Task Gate.
+1. Run the repository-local Concurrent Worktree Check in `concurrent-task-gate.md`.
 2. Read `.project-docs/05-agent-entry/memory-index.md`.
-3. Read the active task record at `.project-docs/30-worklog/tasks/{task_id}.md`.
+3. Read the active task record, or create one for repository-changing work before planning.
 4. Read `.project-docs/00-brief/project-positioning.md`.
 5. Read `.project-docs/30-worklog/current-state.md` as the integrated snapshot.
 6. Read `.project-docs/10-decisions/decision-index.md` and `.project-docs/20-architecture/system-overview.md`.
-7. Inspect other locally active task scopes.
+7. Inspect other locally active worktrees and any available task records for scope overlap.
 
 Then read additional files when relevant:
 
@@ -21,4 +21,4 @@ Then read additional files when relevant:
 - Follow-up, loop, timed check, or restart-point task: `.project-docs/80-commitments/commitments.md`
 - Suspicious integrated context: `.project-docs/90-maintenance/stale-items.md`
 
-Treat shared files as the last integrated snapshot, not as live state from concurrent feature tasks. Do not write a plan until both the Concurrent Task Gate and Planning Gate pass.
+Treat shared files as the last integrated snapshot, not as live state from concurrent feature tasks. Do not write a plan until both the repository-local worktree check and Planning Gate pass. No external Skill or task registry is required.