# BRIEFING — 2026-10-01T20:50:30Z

## Mission
Perform a strict, independent forensic integrity audit on Milestone M2 Iteration 2 deliverables (tile_map_renderer.js, map_render_benchmark.js).

## 🔒 My Identity
- Archetype: forensic_auditor
- Roles: critic, specialist, auditor
- Working directory: c:\Projects\FreeExile\.agents\teamwork\auditor_m2_fix_1
- Original parent: 1cc48fc5-ce57-4f48-8964-24cab4bfcacc
- Target: Milestone M2 Iteration 2 deliverables

## 🔒 Key Constraints
- Audit-only — do NOT modify implementation code
- Trust NOTHING — verify everything independently
- Strict binary verdict: CLEAN or INTEGRITY VIOLATION
- Ground-truth user constraints from ORIGINAL_REQUEST.md take precedence over dispatch prompt
- Non-negotiable binary veto power

## Current Parent
- Conversation ID: 1cc48fc5-ce57-4f48-8964-24cab4bfcacc
- Updated: not yet

## Audit Scope
- **Work product**: client/webapp/js/engine/tile_map_renderer.js, tools/perf/map_render_benchmark.js, tools/perf/stress_test_lru_cache.js
- **Profile loaded**: General Project (Development Integrity Mode per ORIGINAL_REQUEST.md section 2026-10-01T19:19:13Z)
- **Audit type**: forensic integrity check

## Audit Progress
- **Phase**: reporting
- **Checks completed**:
  1. Static analysis: hardcoded outputs, facades, mock cheating (PASSED - CLEAN)
  2. Logic verification: LRU eviction, dirty re-bakes, SAT diamond culling math (PASSED - CLEAN)
  3. Code & Hygiene limits: line limits (tile_map_renderer.js: 294 <= 320, map_render_benchmark.js: 187 <= 200), check_code_and_doc_hygiene.py --strict (PASSED - CLEAN)
  4. Independent test execution: benchmark runner, stress test, pytest suites (81 e2e + 935 unit passed) (PASSED - CLEAN)
  5. Stress test / adversarial counter-examples: active-visible slot protection, dirty re-bake lifecycle, out-of-bounds inputs (PASSED - CLEAN)
- **Checks remaining**: None
- **Findings so far**: CLEAN — No integrity violations detected.

## Attack Surface
- **Hypotheses tested**:
  - H1: Benchmark uses mock cheating or hardcoded returns -> Disproven: dynamic timing and blit counting confirmed.
  - H2: LRU cache evicts visible chunks or does not evict LRU -> Disproven: verified LRU eviction order and active visible chunk protection empirically.
  - H3: Dirty re-bake logic re-bakes clean chunks -> Disproven: verified 0 bakes motionless, 1 bake on dirty chunk, 0 bakes thereafter.
  - H4: SAT culling math has shortcuts or false inclusion/exclusion -> Disproven: verified 4-plane projection mathematically culls phantom chunks at (30,30) and (50,50) to exactly 6 chunks.
  - H5: Code exceeds line limits -> Disproven: tile_map_renderer.js is 294 lines (<= 320), map_render_benchmark.js is 187 lines (<= 200).
- **Vulnerabilities found**: None.
- **Untested angles**: None within M2 deliverable scope.

## Loaded Skills
- None

## Key Decisions Made
- Confirmed full empirical verification of all 3 phases of forensic audit.
- Final Verdict: CLEAN.

## Artifact Index
- c:\Projects\FreeExile\.agents\teamwork\auditor_m2_fix_1\DISPATCH.md — Assignment
- c:\Projects\FreeExile\.agents\teamwork\auditor_m2_fix_1\BRIEFING.md — Working memory
- c:\Projects\FreeExile\.agents\teamwork\auditor_m2_fix_1\progress.md — Liveness heartbeat
- c:\Projects\FreeExile\.agents\teamwork\auditor_m2_fix_1\handoff.md — Final audit verdict report