Runs the test suite once per spawn: run, diagnose failures, apply one fix, re-run to confirm. Returns PASS or a structured FAIL diagnosis. The build-coordinator owns the retry loop (max 5 spawns) — this agent never loops internally.
Post-merge cleanup: confirm the PR actually merged, move the Jira ticket to the project's post-review state, sync the default branch, and delete the merged feature branch.
Encodes the "stage and commit" ritual: verify (receipt gate) → scope → branch → write the commit message from what is actually staged → commit → push → open PR to the default branch → move the Jira issue to In Review. NO merge (merging is the reviewer's call). NO tag (deploys are project-specific and out of scope).