feat: add plugin integration analysis to config-analyze command

Add automatic detection of active marketplace plugins and verification
that CLAUDE.md properly references them. This ensures projects using
marketplace plugins will have proper documentation to guide Claude Code
in using available tools.

Changes:
- Add claude-md-integration.md snippets to all 4 plugins (projman,
  cmdb-assistant, claude-config-maintainer, project-hygiene)
- Update marketplace.json with MCP server mappings for plugin detection
- Enhance /config-analyze to detect active plugins via MCP server names
- Update maintainer agent with plugin integration workflow
- Add plugin coverage percentage to analysis report
- User confirmation required before adding plugin references

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

.claude-plugin/marketplace.json

@@ -11,25 +11,43 @@
       "name": "projman",
       "version": "2.0.0",
       "description": "Sprint planning and project management with Gitea integration",
-      "source": "./plugins/projman"
+      "source": "./plugins/projman",
+      "mcpServers": ["gitea"],
+      "integrationFile": "claude-md-integration.md"
     },
     {
       "name": "project-hygiene",
       "version": "0.1.0",
       "description": "Post-task cleanup hook that removes temp files and manages orphaned files",
-      "source": "./plugins/project-hygiene"
+      "source": "./plugins/project-hygiene",
+      "mcpServers": [],
+      "integrationFile": "claude-md-integration.md",
+      "hooks": ["PostToolUse"]
     },
     {
       "name": "cmdb-assistant",
       "version": "1.0.0",
       "description": "NetBox CMDB integration for infrastructure management",
-      "source": "./plugins/cmdb-assistant"
+      "source": "./plugins/cmdb-assistant",
+      "mcpServers": ["netbox"],
+      "integrationFile": "claude-md-integration.md"
     },
     {
       "name": "claude-config-maintainer",
       "version": "1.0.0",
       "description": "CLAUDE.md optimization and maintenance for Claude Code projects",
-      "source": "./plugins/claude-config-maintainer"
+      "source": "./plugins/claude-config-maintainer",
+      "mcpServers": [],
+      "integrationFile": "claude-md-integration.md"
     }
-  ]
+  ],
+  "pluginDetection": {
+    "mcpServerMapping": {
+      "gitea": "projman",
+      "netbox": "cmdb-assistant"
+    },
+    "hookMapping": {
+      "PostToolUse:Write|Edit": "project-hygiene"
+    }
+  }
 }