feat: add debugging infrastructure and CLAUDE.md optimization

- Add docs/DEBUGGING-CHECKLIST.md with systematic troubleshooting guide
- Enhance SessionStart hooks to detect missing MCP venvs and warn users
- Add Installation Paths and Debugging sections to CLAUDE.md
- Add Plugin Commands by Category table to Quick Start
- Condense Versioning section for better readability
- Add scripts/check-venv.sh for programmatic venv checking
- Update docs/CANONICAL-PATHS.md with new files

Addresses issues #97, #98, #99

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

plugins/projman/README.md

@@ -178,7 +178,9 @@ Sync configuration with current git remote.
 
 **When to use:** After moving or renaming a repository
 
-**Note:** A SessionStart hook automatically detects mismatches and warns you to run `/project-sync`.
+**Note:** A SessionStart hook automatically checks for:
+1. Missing MCP venvs at the installed marketplace location (warns to run setup.sh)
+2. Repository config mismatches (warns to run `/project-sync`)
 
 ### `/review`
 Pre-sprint-close code quality review.