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/release.json

@@ -13,7 +13,7 @@
       "kind": "version-file",
       "path": "VERSION",
       "placeholder": "",
-      "description": "Single-line SemVer source of truth for services and sites."
+      "description": "Single-line SemVer source of truth for services."
     }
   ]
 }