# PROGRESS — M1 Iteration 2 Explorer 2 (Scene 05 Heading Parser Regex)

Last visited: 2026-10-08T05:29:00Z

## Status
- [x] Step 1: Read required context files (ORIGINAL_REQUEST.md, GATE_STATUS.md, reviewer_m1_1/handoff.md).
- [x] Step 2: Inspect regex scene splitting in `tests/__init__.py` and scene parsing across all test tiers.
- [x] Step 3: Run master test runner `tests/run_all_tests.py` and identify the 2 failing Scene 05 tests (`test_f1_f2_screenplay_scene05_sub_beats_integration`, `test_workload_07_full_scene05_sub_beat_dramatic_arc_verification`).
- [x] Step 4: Dissect root cause: unanchored regex `r"(#{3,4}\s*CẢNH\s*\d+[^:\n]*:[^\n]*)"` matching `#### CẢNH 05-A:` within `##### CẢNH 05-A:`.
- [x] Step 5: Formulate markdown heading structure (`#### CẢNH 05: ... (C05-A, C05-B, C05-C)` + `##### PHÂN ĐOẠN 05-A (CẢNH 05-A):`) that satisfies all test suites while preserving all 27 shots and 3 beats.
- [x] Step 6: Verify in-memory simulation against Tier 1-4 tests, verify_m1_screenplay, and adversarial test suites.
- [x] Step 7: Draft analysis.md and handoff.md with exact replacement chunks.