Jordan Ritter 2e85bfab08 fix(showcase/ci): verify partial deploys and stop cross-commit verify preemption ...

Two independent ways verification was silently lost on 2026-07-25.

1. `resolve-matrix` required `github.event.workflow_run.conclusion ==
   'success'`. But `redeploy-staging` gates on the artifact-derived
   `any_success`, not on the matrix rollup, so a build with some slots
   cancelled (rollup `cancelled`) or failed (rollup `failure`) still
   pushes real images and still redeploys the slots that built. Run
   30162773601 redeployed 23 services to staging and this workflow never
   started. An unverified real deploy is worse than a verified partial
   one, so the trigger is now "the build reached a terminal conclusion"
   and WHAT to verify stays decided by evidence: no redeploy-summary
   artifact still means has_services=false and verify is skipped, and the
   redeploy gate still narrows to the per-service success set, so a
   cancelled slot can never be probed against a stale `:latest`.

2. The `showcase-verify-deploy` concurrency group was global, so any
   later-finishing build preempted an earlier run's verification even
   though they verify DIFFERENT commits. Verify run 30163309977 for the
   one genuinely successful build of the day (#6168, 7282ecddf) started
   at 15:17:13 and was cancelled 9 seconds later by run 30163312882 —
   which was triggered by a different, partially-cancelled build and then
   skipped every job anyway. Key the group per triggering commit.

2026-07-25 10:05:22 -07:00

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