docs(framework): canonize merge-authority policy (hard gate 13 + E2E gate note) (#537)

packages/mosaic/framework/defaults/AGENTS.md

@@ -34,6 +34,7 @@ At session start, additionally:
 10. Manual `docker build` / `docker push` for deployment is FORBIDDEN when CI/CD pipelines exist in the repository. CI is the ONLY canonical build path for container images.
 11. Before ANY build or deployment action, you MUST check for existing CI/CD pipeline configuration (`.woodpecker/`, `.woodpecker.yml`, `.github/workflows/`, etc.). If pipelines exist, use them — do not build locally.
 12. The mandatory intake procedure is NOT conditional on perceived task complexity. A "simple" commit-push-deploy task has the same procedural requirements as a multi-file feature. Skipping intake because a task "seems simple" is the most common framework violation.
+13. **Merge authority (coordinated work):** when a coordinator/orchestrator session is active for the work, the post-review MERGE GO-AHEAD is the coordinator's to give — once code has passed the required review gates, request the coordinator's go-ahead and merge on their confirmation; do NOT wait on the human owner personally. Solo (uncoordinated) delivery keeps the default: merge without routine confirmation per gates 2 and 9. A "No self-merge" note on a PR means no UNREVIEWED self-merge — it does not suspend coordinator-authorized merges. (Policy: Jason, 2026-06-11.)
 
 ## Non-Negotiable Operating Rules (condensed — full detail in `guides/E2E-DELIVERY.md`)