refactor(cmdb-assistant): extract skills and slim commands

- Extract 9 skill files from command knowledge:
  - mcp-tools-reference.md: Complete NetBox MCP tools reference
  - system-discovery.md: Bash commands for system info gathering
  - device-registration.md: Device registration workflow
  - sync-workflow.md: Machine sync process
  - audit-workflow.md: Data quality audit checks
  - ip-management.md: IP/prefix management and conflict detection
  - topology-generation.md: Mermaid diagram generation
  - change-audit.md: NetBox change audit workflow
  - visual-header.md: Standard visual header pattern

- Slim all 11 commands to under 60 lines:
  - cmdb-sync.md: 348 -> 57 lines
  - cmdb-register.md: 334 -> 51 lines
  - ip-conflicts.md: 238 -> 58 lines
  - cmdb-audit.md: 207 -> 58 lines
  - cmdb-topology.md: 194 -> 54 lines
  - initial-setup.md: 176 -> 74 lines
  - change-audit.md: 175 -> 57 lines
  - cmdb-site.md: 68 -> 50 lines
  - cmdb-ip.md: 65 -> 52 lines
  - cmdb-device.md: 64 -> 55 lines
  - cmdb-search.md: 46 lines (unchanged)

- Update agent to reference skills for best practices
- Preserve existing netbox-patterns skill

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

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

@@ -1,19 +1,12 @@
 # CMDB Site Management
 
-## Visual Output
-
-When executing this command, display the plugin header:
-
-```
-┌──────────────────────────────────────────────────────────────────┐
-│  🖥️ CMDB-ASSISTANT · Site Management                             │
-└──────────────────────────────────────────────────────────────────┘
-```
-
-Then proceed with the operation.
-
 Manage sites and locations in NetBox.
 
+## Skills to Load
+
+- `skills/visual-header.md`
+- `skills/mcp-tools-reference.md`
+
 ## Usage
 
 ```
@@ -22,46 +15,35 @@ Manage sites and locations in NetBox.
 
 ## Instructions
 
-You are a site/location management assistant with access to NetBox.
+Execute `skills/visual-header.md` with context "Site Management".
 
 ### Actions
 
 **Sites:**
-- `list` - List all sites using `dcim_list_sites`
-- `show <name>` - Get site details using `dcim_get_site`
-- `create <name>` - Create new site using `dcim_create_site`
-- `update <name>` - Update site using `dcim_update_site`
+- `list` - List all sites: `dcim_list_sites`
+- `show <name>` - Get site details: `dcim_get_site`
+- `create <name>` - Create new site: `dcim_create_site`
+- `update <name>` - Update site: `dcim_update_site`
 - `delete <name>` - Delete site (with confirmation)
 
-**Locations (within sites):**
-- `locations at <site>` - List locations using `dcim_list_locations`
-- `create location <name> at <site>` - Create location using `dcim_create_location`
+**Locations:**
+- `locations at <site>` - List locations: `dcim_list_locations`
+- `create location <name> at <site>` - Create location
 
 **Racks:**
-- `racks at <site>` - List racks using `dcim_list_racks`
-- `create rack <name> at <site>` - Create rack using `dcim_create_rack`
+- `racks at <site>` - List racks: `dcim_list_racks`
+- `create rack <name> at <site>` - Create rack
 
 **Regions:**
-- `regions` - List regions using `dcim_list_regions`
-- `create region <name>` - Create region using `dcim_create_region`
-
-### Site Properties
-
-When creating/updating sites:
-- name (required)
-- slug (required, auto-generated if not provided)
-- status: active, planned, staging, decommissioning, retired
-- region: parent region ID
-- facility: datacenter/building name
-- physical_address, shipping_address
-- time_zone
+- `regions` - List regions: `dcim_list_regions`
+- `create region <name>` - Create region
 
 ## Examples
 
-- `/cmdb-site list` - Show all sites
-- `/cmdb-site show headquarters` - Get HQ site details
-- `/cmdb-site create branch-office-nyc` - Create new site
-- `/cmdb-site racks at headquarters` - List racks at HQ
+- `/cmdb-site list`
+- `/cmdb-site show headquarters`
+- `/cmdb-site create branch-office-nyc`
+- `/cmdb-site racks at headquarters`
 
 ## User Request