fix(scripts): MCP server mapping and CLAUDE.md section markers

Issue 1 - MCP Server Mapping:
- Add mcp_servers field to plugin.json for plugins using shared MCP servers
- projman/pr-review now install gitea MCP server
- cmdb-assistant now installs netbox MCP server
- Scripts read MCP server names from plugin.json

Issue 2 - CLAUDE.md Section Markers:
- Install wraps content with HTML comment markers for precise removal
- Uninstall uses markers first, falls back to legacy header detection
- Fixes code block false positives during uninstall

Bug fix:
- Change ((servers_added++)) to ((++servers_added)) to avoid exit code 1
  with set -e when incrementing from 0

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

plugins/projman/.claude-plugin/plugin.json

@@ -16,5 +16,6 @@
     "agile",
     "lessons-learned"
   ],
+  "mcp_servers": ["gitea"],
   "commands": ["./commands/"]
 }