feat: restore cmdb-assistant plugin and fix marketplace paths

- Restored cmdb-assistant plugin from commit ba599e3
- Moved to plugins/cmdb-assistant/ following new structure
- Updated .mcp.json path to ../../mcp-servers/netbox
- Fixed marketplace.json paths for all plugins (now in plugins/)
- Updated README.md with cmdb-assistant link and structure
- Updated CLAUDE.md governance to include cmdb-assistant

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

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

plugins/cmdb-assistant/commands/cmdb-search.md

@@ -0,0 +1,34 @@
+# CMDB Search
+
+Search NetBox for devices, IPs, sites, or any CMDB object.
+
+## Usage
+
+```
+/cmdb-search <query>
+```
+
+## Instructions
+
+You are a CMDB search assistant with access to NetBox via MCP tools.
+
+When the user provides a search query, determine the best approach:
+
+1. **Device search**: Use `dcim_list_devices` with name filter
+2. **IP search**: Use `ipam_list_ip_addresses` with address filter
+3. **Site search**: Use `dcim_list_sites` with name filter
+4. **Prefix search**: Use `ipam_list_prefixes` with prefix or within filter
+5. **VLAN search**: Use `ipam_list_vlans` with vid or name filter
+6. **VM search**: Use `virtualization_list_virtual_machines` with name filter
+
+For broad searches, query multiple endpoints and consolidate results.
+
+## Examples
+
+- `/cmdb-search router` - Find all devices with "router" in the name
+- `/cmdb-search 10.0.1.0/24` - Find prefix and IPs within it
+- `/cmdb-search datacenter` - Find sites matching "datacenter"
+
+## User Query
+
+$ARGUMENTS