feat(standards): drop the site CI variant + require changelog reconciliation before release

- Remove the push-triggered build-and-deploy-site pipeline and every "site"
  reference; Type B is now a single tag-triggered service pipeline
  (service-docker.yaml).
- Inventory now covers packages + the auth-server service only (repos.json
  11 -> 9; docs/mcp are no longer part of the standard).
- Versioning standard: reconcile [Unreleased] against the last tag before
  promoting, and always show proposed entries to the user for approval.
- Update registry.py compliance/release text and list_repos types, build.py
  component descriptions, and rebuild the MCP bundle + lib/wiki HTML.

standards/mcp/repos.json

@@ -144,26 +144,6 @@
         "wiki"
       ],
       "mcp": null
-    },
-    {
-      "name": "docs",
-      "type": "site",
-      "path": "docs",
-      "version_source": "VERSION",
-      "drone": "service-docker.yaml",
-      "trigger": "push",
-      "docs": [],
-      "mcp": null
-    },
-    {
-      "name": "mcp",
-      "type": "site",
-      "path": "mcp",
-      "version_source": "VERSION",
-      "drone": "service-docker.yaml",
-      "trigger": "push",
-      "docs": [],
-      "mcp": null
     }
   ]
 }