fix(marketplace): correct stale hook references and migration guide errors

- claude-config-audit-settings.md: update hook inventory to post-Decision #29 state
- maintainer.md: remove PostToolUse references, update to current hook types
- settings-optimization.md: update review layer table and hooks.json format
- claude-config-optimize-settings.md: fix stale doc-guardian PostToolUse reference
- project-hygiene/claude-md-integration.md: rewrite for manual /hygiene check
- doc-guardian: update doc-sync.md and sync-workflow.md hook references
- MIGRATION-v9.md: mark deleted commands as Removed, not renamed
- projman/task-sizing.md: PostToolUse → PreToolUse in example
- scripts/setup.sh: /labels-sync → /labels sync
- docs/CONFIGURATION.md: doc-guardian "Commands and hooks" → "Commands only"
- docs/prompts/INDEX.md: add prompt execution index

Version: 9.0.1

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

docs/CONFIGURATION.md

@@ -485,7 +485,7 @@ Not all plugins have MCP servers. The install script handles this automatically:
 | projman | ✓ (via gitea) | Issue, wiki, PR tools |
 | pr-review | ✓ (via gitea) | PR review tools |
 | git-flow | ✗ | Commands only |
-| doc-guardian | ✗ | Commands and hooks only |
+| doc-guardian | ✗ | Commands only |
 | code-sentinel | ✗ | Commands and hooks only |
 | clarity-assist | ✗ | Commands only |