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/src/mkdocs.lib.yml

@@ -64,6 +64,7 @@ nav:
   - Human-in-the-Loop: 08_human_in_loop.md
   - Infra Adapters: 09_infra_adaptors.md
   - Drone Pipelines: 10_drone_pipelines.md
+  - Versioning & Changelog: 11_versioning_and_changelog.md
   - Genericity Matrix: 12_genericity_matrix.md
   - Auth Integration: 14_auth_integration.md
   - Library Registry: 13_library_registry.md