# Progress — Challenger 2 (Portal Session Cleanup Stress)

- **Status**: Completed Empirical Testing & Final Handoff Preparation
- **Last visited**: 2026-10-01T08:01:25Z
- **Milestone**: Milestone 3 Iteration 2
- **Completed Tasks**:
  - Implemented empirical test suite `tests/security_fuzzing/test_map_device_portal_cleanup_adversarial.py` (292 lines).
  - Executed 100-cycle high-volume stress harness: PASSED (0 orphaned sessions, dev.active_instance_id reset).
  - Executed exhausted portal 7th entry and boundary attacks: PASSED (safe rejection, zero underflow).
  - Executed calling convention parity (None vs ZoneEngine, positional normalizer): PASSED.
  - Executed 50-player concurrency and 20-thread multi-threaded stress: PASSED.
  - Identified edge-case finding: unexhausted map overwrite leaks prior ZoneEngine session (documented and tracked via XFAIL).
  - Verdict: **APPROVE**.