fix: add missing plugin declarations and fix hardcoded paths

- projman/plugin.json: Added commands, agents, and skills declarations
- project-hygiene/plugin.json: Added hooks declaration for PostToolUse
- projman/.mcp.json: Changed hardcoded paths to ${CLAUDE_PLUGIN_ROOT}
- cmdb-assistant/.mcp.json: Changed hardcoded paths to ${CLAUDE_PLUGIN_ROOT}

Plugins were not being recognized because plugin.json files only had
metadata but no component declarations.

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

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

plugins/cmdb-assistant/.mcp.json

@@ -1,11 +1,11 @@
 {
   "mcpServers": {
     "netbox": {
-      "command": "/home/lmiranda/repos/bandit/support-claude-mktplace/mcp-servers/netbox/.venv/bin/python",
+      "command": "${CLAUDE_PLUGIN_ROOT}/../../mcp-servers/netbox/.venv/bin/python",
       "args": ["-m", "mcp_server.server"],
-      "cwd": "/home/lmiranda/repos/bandit/support-claude-mktplace/mcp-servers/netbox",
+      "cwd": "${CLAUDE_PLUGIN_ROOT}/../../mcp-servers/netbox",
       "env": {
-        "PYTHONPATH": "/home/lmiranda/repos/bandit/support-claude-mktplace/mcp-servers/netbox"
+        "PYTHONPATH": "${CLAUDE_PLUGIN_ROOT}/../../mcp-servers/netbox"
       }
     }
   }