chore(config): settings.json + .gitignore hygiene (T-1100)

Remove dead docs-search allow; promote godot4/gdformat/atlas/validate-ron; add repo-tree Edit/Write + worktree-setup allows. .gitignore ignores .claude/scheduled_tasks.lock/.json. Part of T-1099 (Claude estate cleanup).

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

.gitignore

@@ -102,6 +102,8 @@ wiki/economics/corporations/generated_corporations.toml
 .claude/plans/
 .claude/projects/
 .claude/agent-memory/
+.claude/scheduled_tasks.lock
+.claude/scheduled_tasks.json
 .tmp/
 
 # Local agent tooling caches (per-machine, not shared)