docs(marketplace): README rewrite, scripts audit, stale reference cleanup (v9.1.1)

- README.md fully rewritten: clean domain-grouped plugin tables, accurate
  structure tree matching CANONICAL-PATHS, all 10 scripts and 7 docs listed
- CLAUDE.md structure tree updated to match (was showing only 12 plugins)
- Deleted scripts/check-venv.sh (dead code for unimplemented SessionStart hooks)
- Fixed stale .doc-guardian-queue references in doc-sync.md and sync-workflow.md
- Removed check-venv.sh from CANONICAL-PATHS.md, added missing consumer scripts
- Version bumped to 9.1.1

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

plugins/doc-guardian/commands/doc-sync.md

@@ -22,11 +22,11 @@ Apply all pending documentation updates detected by `/doc audit`.
 
 ## Process
 
-1. **Review Pending Queue**
-   Execute `skills/sync-workflow.md` - read `.doc-guardian-queue`
+1. **Detect Drift**
+   Run `/doc audit` first (or use its most recent results) to identify documentation that is out of sync with code.
 
 2. **Batch Updates**
-   For each pending item:
+   For each drift item:
    - Show the specific change needed
    - Apply the update
    - Track in change list
@@ -36,8 +36,5 @@ Apply all pending documentation updates detected by `/doc audit`.
    - Single commit: `docs: sync documentation with code changes`
    - Include summary in commit body
 
-4. **Clear Queue**
-   After successful sync, clear the queue file
-
-5. **Output**
+4. **Output**
    Use format from `skills/sync-workflow.md`