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/templates/app/CHANGELOG.md

@@ -5,6 +5,13 @@ All notable changes to this project are documented here.
 The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/)
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
+<!--
+Keep [Unreleased] current as you land changes. On release, reconcile it against
+the change (git log / git diff since the last tag), add any missing user-facing
+entries, and get the user's approval before promoting it into a version heading.
+See standards: Versioning & Changelog (registry://release).
+-->
+
 ## [Unreleased]
 
 ### Added