Phase 0 of the scheduler hardening plan is done:
- 0.1 (three-path skip symmetry): landed as test_res_account_symmetry.c
(b20caf8d), mutation-injection red-proven.
- 0.2 (rejoin trigger contract): audit found the contract fully covered
by test_scheduler_decision_publish_retry.c's five rejoin tests plus
test_scheduler_connect.c's no-io callback scan -- documented in the
plan instead of adding duplicate tests.
- 0.3 (two-round zero drift): folded into 0.1's
test_two_rounds_zero_drift_with_reconciling_worker, same shape.
Co-Authored-By: Claude Code <noreply@anthropic.com>
