- v2-phase5.AC11.2: Add test_first_attempt_has_no_previous_attempt Verifies that previous_attempt is None on first attempt. Creates a task with no "previous_attempt" key in metadata and confirms the orchestrator correctly derives previous_attempt = None when building AgentContext (orchestrator.rs:793-795). - v2-phase5.AC12.2: Add test_unrelated_task_unaffected_by_failure_cascade Verifies that an unrelated task C (no dependency on failed task A) remains in Ready status when failure cascading occurs. Tests that cascade blocking is dependency-aware and does not affect unrelated tasks. All 467 tests pass. Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>