feat(standards): serve service version-wiring rule + bundle wiki pages in MCP

Versioning standard now states services must read their VERSION (e.g. a build arg) rather than hardcoding it; the compliance prompt repeats it. build_bundle also bundles src/wiki/** as wiki_-prefixed modules (e.g. docs://modules/wiki_development_releasing), so the release runbook is reachable from the MCP. Bundle grows to 22 modules.

standards/mcp/index.json

@@ -1,6 +1,6 @@
 {
   "project": "standards",
   "type": "standards",
-  "modules_count": 16,
+  "modules_count": 22,
   "source": "hand-authored"
 }