The --isolate flag was rewritten in PR #4570 to use temp overlay
files instead of mutating originals in place. Add sections to
DEBUGGING.md (how it works, troubleshooting) and RUNBOOK.md
(operational notes for parallel runs and cleanup).
Production showcase-aimock was running a week-old image because fixture
file changes in showcase/aimock/ did not trigger a CI rebuild. This adds
showcase-aimock to the Build & Deploy workflow matrix so it auto-deploys
on merge, creates a thin Dockerfile that bakes fixture files into the
image, documents the local-vs-production parity requirement in
docker-compose.local.yml, and adds an aimock fixture deployment section
to the RUNBOOK.
Jordan Ritter