Review all test suites, delete stale

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.

Merged #5479: 3 flakes fixed by cause and induced (console rate-limit leak, access-requests approve wait, live-cast recorder); ~85s sleeping cut (automation 54.7→~5s, NodeVault 31/21→4s). Full gate green; dev deploy succeeded. Deferred: NodeVault post-restart wake, slow approve.