feat(standards): add versioning + changelog standard, release templates, and Drone version guard

Add lib page 11 (SemVer contract, pre-1.0 rule, tag==version invariant, Keep a Changelog), the releasing wiki runbook, and canonical release templates (CHANGELOG.md, VERSION). Vendor them into the MCP bundle as templates/release + release.json and expose registry://release with list/get tools. Add a changelog component to the app template. Enforce the tag<->version contract in both Drone shapes: Type A check-version and the backfill loop verify pyproject version; Type B adds a VERSION guard step.

standards/mcp/nav.json

@@ -49,6 +49,11 @@
     "resource": "docs://modules/drone_pipelines",
     "title": "Drone Pipelines"
   },
+  {
+    "module": "versioning_and_changelog",
+    "resource": "docs://modules/versioning_and_changelog",
+    "title": "Versioning & Changelog"
+  },
   {
     "module": "genericity_matrix",
     "resource": "docs://modules/genericity_matrix",