# BRIEFING — 2026-10-03T09:18:00Z

## Mission
Remediate file length Hard Cap violation in tests/unit/test_challenger_cocos_kinematics_stress.ts by modularizing into companion helper files (all <= 350 lines) while preserving all 27 tests and passing hygiene checks.

## 🔒 My Identity
- Archetype: worker
- Roles: implementer, qa
- Working directory: c:\Projects\FreeExile\.agents\teamwork\worker_hygiene_remediation
- Original parent: cecb05d6-3b1b-4c90-84e7-b52ac4e7697c
- Milestone: Remediation of file length violation in tests/unit/test_challenger_cocos_kinematics_stress.ts

## 🔒 Key Constraints
- Code logic <= 350 lines (soft cap), <= 500 lines (hard cap)
- Preserve all 27 checks in test_challenger_cocos_kinematics_stress.ts
- All newly created/split files must be <= 350 lines
- python tools/lint/check_code_and_doc_hygiene.py --strict must exit 0 with 0 violations
- npx tsx tests/unit/test_challenger_cocos_kinematics_stress.ts must pass (27/27 checks)

## Current Parent
- Conversation ID: cecb05d6-3b1b-4c90-84e7-b52ac4e7697c
- Updated: 2026-10-03T09:18:00Z

## Task Summary
- **What to build**: Modularize test_challenger_cocos_kinematics_stress.ts into modular files (e.g. tests/unit/kinematics_stress_helpers.ts), ensuring all <= 350 lines.
- **Success criteria**: 27/27 checks pass, hygiene check exits 0, tsc compiles cleanly.
- **Interface contracts**: AGENTS.md § 10
- **Code layout**: tests/unit/

## Key Decisions Made
- Extracted `StressTestHarness`, `SimpleGrid`, `runScenario1_ZeroMomentum`, and `runScenario2_WallSliding` into `tests/unit/kinematics_stress_helpers.ts` (301 lines).
- Refactored `tests/unit/test_challenger_cocos_kinematics_stress.ts` to host scenarios 3, 4, 5 and main runner (333 lines).
- Both files now comply with the Soft Cap (<= 350 lines).

## Artifact Index
- `tests/unit/kinematics_stress_helpers.ts` — Extracted test harness, SimpleGrid mock, scenarios 1 & 2
- `tests/unit/test_challenger_cocos_kinematics_stress.ts` — Main test entry point and scenarios 3, 4, 5
- `c:\Projects\FreeExile\.agents\teamwork\worker_hygiene_remediation\handoff.md` — 5-component handoff report

## Change Tracker
- **Files modified**:
  - `tests/unit/kinematics_stress_helpers.ts`: Created new helper module (301 lines)
  - `tests/unit/test_challenger_cocos_kinematics_stress.ts`: Modularized down to 333 lines from 566 lines
- **Build status**: Pass (npx tsx 27/27 passed, tsc 0 errors, check_code_and_doc_hygiene.py exit code 0)
- **Pending issues**: None

## Quality Status
- **Build/test result**: PASS (27/27 checks passed)
- **Lint status**: PASS (0 Hard Cap errors across the entire codebase)
- **Tests added/modified**: Full preservation and zero regression of 27 empirical adversarial stress checks

## Loaded Skills
- None