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>

.claude-plugins/projman-marketplace/.claude-plugin/marketplace.json

@@ -16,6 +16,12 @@
       "version": "0.1.0",
       "description": "Post-task cleanup hook that removes temp files, warns about unexpected root files, and manages orphans",
       "source": "./../../project-hygiene"
+    },
+    {
+      "name": "cmdb-assistant",
+      "version": "1.0.0",
+      "description": "NetBox CMDB integration for infrastructure management - query, create, update, and manage network devices, IP addresses, sites, and more",
+      "source": "./../../cmdb-assistant"
     }
   ]
 }