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/skills/topology-generation.md

@@ -0,0 +1,155 @@
+# Topology Generation Skill
+
+Generate Mermaid diagrams from NetBox data.
+
+## Prerequisites
+
+Load skill: `mcp-tools-reference`
+
+## View: Rack Elevation
+
+### Data Collection
+
+1. Find rack: `dcim_list_racks name=<name>`
+2. Get devices: `dcim_list_devices rack_id=<id>`
+3. Note for each: `position`, `u_height`, `face`, `name`, `role`
+
+### Mermaid Template
+
+```mermaid
+graph TB
+    subgraph rack["Rack: <rack-name> (U<height>)"]
+        direction TB
+        u42["U42: empty"]
+        u41["U41: empty"]
+        u40["U40: server-01 (Server)"]
+        u39["U39: server-01 (cont.)"]
+        u38["U38: switch-01 (Switch)"]
+    end
+```
+
+### Rules
+
+- Mark top U with device name and role
+- Mark subsequent Us as "(cont.)" for multi-U devices
+- Empty Us show "empty"
+
+## View: Network Topology
+
+### Data Collection
+
+1. List sites: `dcim_list_sites`
+2. List devices: `dcim_list_devices site_id=<id>`
+3. List cables: `dcim_list_cables`
+4. List interfaces: `dcim_list_interfaces device_id=<id>`
+
+### Mermaid Template
+
+```mermaid
+graph TD
+    subgraph site1["Site: Home"]
+        router1[("core-router-01<br/>Router")]
+        switch1[["dist-switch-01<br/>Switch"]]
+        server1["web-server-01<br/>Server"]
+        server2["db-server-01<br/>Server"]
+    end
+
+    router1 -->|"eth0 - eth1"| switch1
+    switch1 -->|"gi0/1 - eth0"| server1
+    switch1 -->|"gi0/2 - eth0"| server2
+```
+
+### Node Shapes by Role
+
+| Role | Shape | Mermaid Syntax |
+|------|-------|----------------|
+| Router | Cylinder | `[(" ")]` |
+| Switch | Double brackets | `[[ ]]` |
+| Server | Rectangle | `[ ]` |
+| Firewall | Hexagon | `{{ }}` |
+| Other | Rectangle | `[ ]` |
+
+### Edge Labels
+
+Show interface names: `A-side - B-side`
+
+## View: Site Overview
+
+### Data Collection
+
+1. Get site: `dcim_get_site id=<id>`
+2. List racks: `dcim_list_racks site_id=<id>`
+3. Count devices per rack: `dcim_list_devices rack_id=<id>`
+
+### Mermaid Template
+
+```mermaid
+graph TB
+    subgraph site["Site: Headquarters"]
+        subgraph row1["Row 1"]
+            rack1["Rack A1<br/>12/42 U used<br/>5 devices"]
+            rack2["Rack A2<br/>20/42 U used<br/>8 devices"]
+        end
+        subgraph row2["Row 2"]
+            rack3["Rack B1<br/>8/42 U used<br/>3 devices"]
+        end
+    end
+```
+
+## View: Full Infrastructure
+
+### Data Collection
+
+1. List regions: `dcim_list_regions`
+2. List sites: `dcim_list_sites`
+3. Count devices: `dcim_list_devices status=active`
+
+### Mermaid Template
+
+```mermaid
+graph TB
+    subgraph region1["Region: Americas"]
+        site1["Headquarters<br/>3 racks, 25 devices"]
+        site2["Branch Office<br/>1 rack, 5 devices"]
+    end
+    subgraph region2["Region: Europe"]
+        site3["EU Datacenter<br/>10 racks, 100 devices"]
+    end
+
+    site1 -.->|"WAN Link"| site3
+```
+
+## Output Format
+
+Always provide:
+
+1. **Summary** - Brief description of diagram content
+2. **Mermaid Code Block** - The diagram code
+3. **Legend** - Explanation of shapes and colors
+4. **Data Notes** - Any data quality issues
+
+### Example Output
+
+```markdown
+## Network Topology: Home Site
+
+This diagram shows network connections between 4 devices at Home site.
+
+```mermaid
+graph TD
+    router1[("core-router<br/>Router")]
+    switch1[["main-switch<br/>Switch"]]
+    server1["homelab-01<br/>Server"]
+
+    router1 -->|"eth0 - gi0/24"| switch1
+    switch1 -->|"gi0/1 - eth0"| server1
+```
+
+**Legend:**
+- Cylinder shape: Routers
+- Double brackets: Switches
+- Rectangle: Servers
+
+**Data Notes:**
+- 1 device (nas-01) has no cable connections documented
+```