Clean up and fix CI tests

Review all test suites, delete stale, superseeded, those that were one off to check feature flags or absence of something. Kill the most long running or flaky with unit tests that execute in milliseconds. Regroup between quick and full, Fix broken tests in CI - GitHub Actions - look at a few recent test runs and fix broken/flaky tests. Babysit CI/CD until the tests (test.yaml) pass.

CI fixed: develop test.yml green on merge (run 37730118051). Fixed e2e org slug, terraform registry re-ask, a heartbeat-write flake; split TaskDetailPage suite (vitest 81.8s→70.7s); dropped 1 dead guard. API/smoke measured flat, left.