[Docs]: Add WebSocket (ws) example to mcp-integration skill

[sjnims]

Which documentation needs improvement?

Skill documentation

Specific Location

plugins/plugin-dev/skills/mcp-integration/examples/

What's unclear or missing?

The mcp-integration skill documents 4 MCP server types in SKILL.md:

• stdio ✓
• SSE ✓
• HTTP ✓
• WebSocket ✓

However, the examples/ directory only contains 3 example files:

• stdio-server.json ✓
• sse-server.json ✓
• http-server.json ✓
• ws-server.json ✗ missing

This creates a completeness gap where users looking for a copy-paste WebSocket example must extract it from the SKILL.md body (around line 118) rather than having a dedicated, well-commented example file like the other server types.

Suggested Improvement

Add examples/ws-server.json following the same pattern as existing example files:

{
  "_comment": "Example WebSocket MCP server configuration for real-time bidirectional communication",
  "realtime-service": {
    "type": "ws",
    "url": "wss://mcp.example.com/ws",
    "headers": {
      "Authorization": "Bearer ${TOKEN}"
    }
  },
  "streaming-data": {
    "type": "ws",
    "url": "wss://stream.example.com/mcp",
    "headers": {
      "X-API-Key": "${API_KEY}",
      "X-Client-ID": "${CLIENT_ID}"
    }
  }
}

Also update the "Example Configurations" section in SKILL.md (around line 528) to include:

- **`ws-server.json`** - WebSocket server for real-time communication

Type of issue

• Missing information

Additional Context

• Discovered during: Comprehensive skill review comparing SKILL.md content against examples/ directory
• Priority: Low - the inline documentation in SKILL.md is sufficient, but adding the example improves completeness and consistency with other server types
• Measurements: SKILL.md has 1,663 words covering all 4 types; examples should match this coverage

[sjnims]

PR submitted: #71