fix: critical plugin structure and configuration fixes

- Fix hooks.json: use valid PostToolUse event (not invalid task-completed)
- Move projman/plugin.json to projman/.claude-plugin/plugin.json
- Fix projman/.mcp.json to use venv python paths
- Add cmdb-assistant to marketplace.json
- Update .gitignore: allow .env files (private repo)
- Fix create_labels.py: use env vars instead of hardcoded token
- Add CLAUDE.md critical rules section to prevent future mistakes

🤖 Generated with [Claude Code](https://claude.com/claude-code)

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

.gitignore

@@ -26,9 +26,7 @@ MANIFEST
 venv/
 ENV/
 env/
-.venv
-.ENV
-.env.local
+.venv/
 
 # PyCharm
 .idea/
@@ -62,10 +60,10 @@ package-lock.json
 dist/
 build/
 
-# Environment variables (IMPORTANT: Contains Gitea credentials)
-.env
-.env.local
-.env.*.local
+# Environment variables - NOT ignored (private repo)
+# .env
+# .env.local
+# .env.*.local
 
 # OS
 .DS_Store