# Dispatch Assignment — Worker M1 Fix 1

## Mission
Apply the verified fixes from the 3 Explorers for Milestone M1 Iteration 2:
1. Update `client/webapp/js/engine/tile_grid_loader.js`:
   - Replace top-level window assignments with universal global binding `root` (`typeof window !== "undefined" ? window : (typeof globalThis !== "undefined" ? globalThis : global)`).
   - Use positive containment bounds checking `if (!grid || !(ix >= 0 && ix < w && iy >= 0 && iy < h)) return 2;` and guard against `!Number.isFinite(tx) || !Number.isFinite(ty)`.
   - Add upfront expected buffer length validation in `loadBinaryMap`: `minExpectedLength = 16 + poiCount * 3 + encounterCount * 5 + gridLength`.
2. Update `tests/unit/test_wilderness_map_generator.py`:
   - Add the 6 complementary test cases designed and verified by `explorer_m1_fix_2` (verifying `getTileAt(NaN, 0)`, un-shimmed Node.js require, non-finite inputs, and upfront buffer truncation).
   - Keep file length <= 350 lines (soft cap).

## Mandatory Integrity Warning
DO NOT CHEAT. All implementations must be genuine. DO NOT hardcode test results, create dummy/facade implementations, or circumvent the intended task. A teamwork_preview_auditor will independently verify your work. Integrity violations WILL be detected and your work WILL be rejected.

## Context & Inputs
- Authoritative User Request: `c:\Projects\FreeExile\.agents\teamwork\ORIGINAL_REQUEST.md` (read `## 2026-10-01T19:19:13Z`).
- Explorer Fix 1 Report: `c:\Projects\FreeExile\.agents\teamwork\explorer_m1_fix_1\handoff.md`.
- Explorer Fix 2 Report: `c:\Projects\FreeExile\.agents\teamwork\explorer_m1_fix_2\handoff.md`.
- Explorer Fix 3 Report: `c:\Projects\FreeExile\.agents\teamwork\explorer_m1_fix_3\handoff.md`.
- Reference proposed files:
  - `c:\Projects\FreeExile\.agents\teamwork\explorer_m1_fix_2\proposed_tile_grid_loader.js`
  - `c:\Projects\FreeExile\.agents\teamwork\explorer_m1_fix_2\proposed_test_wilderness_map_generator.py`

## Verification Requirements
- `pytest tests/unit/test_wilderness_map_generator.py -v` (26 passed)
- `node tests/unit/test_challenger_tile_grid_stress.js` (ALL 8 ADVERSARIAL ATTACK VECTORS DEFEATED)
- `pytest tests/e2e/test_poe2_map_system_e2e.py -v` (81 passed)
- `python tools/lint/check_code_and_doc_hygiene.py --strict` (0 Hard Cap violations)

## Deliverable
Write your handoff report to:
`c:\Projects\FreeExile\.agents\teamwork\worker_m1_fix_1\handoff.md`
and notify parent when complete.

## 2026-10-01T19:52:06Z
You are M1 Fix Worker.
Your working directory is: c:\Projects\FreeExile\.agents\teamwork\worker_m1_fix_1
Your dispatch assignment is: c:\Projects\FreeExile\.agents\teamwork\worker_m1_fix_1\DISPATCH.md
MANDATORY: Read the authoritative user request at:
c:\Projects\FreeExile\.agents\teamwork\ORIGINAL_REQUEST.md (specifically section ## 2026-10-01T19:19:13Z).
Also consult c:\Projects\FreeExile\GEMINI.md and c:\Projects\FreeExile\AGENTS.md.

MANDATORY INTEGRITY WARNING:
DO NOT CHEAT. All implementations must be genuine. DO NOT hardcode test results, create dummy/facade implementations, or circumvent the intended task. A teamwork_preview_auditor will independently verify your work. Integrity violations WILL be detected and your work WILL be rejected.

Apply the verified fixes from the 3 Explorers:
1. Update client/webapp/js/engine/tile_grid_loader.js with positive containment getTileAt, universal root binding, and upfront buffer length validation (reference: c:\Projects\FreeExile\.agents\teamwork\explorer_m1_fix_2\proposed_tile_grid_loader.js).
2. Update tests/unit/test_wilderness_map_generator.py with complementary test cases (reference: c:\Projects\FreeExile\.agents\teamwork\explorer_m1_fix_2\proposed_test_wilderness_map_generator.py, keep <= 350 lines).
3. Run verification tests:
   - pytest tests/unit/test_wilderness_map_generator.py -v
   - node tests/unit/test_challenger_tile_grid_stress.js
   - pytest tests/e2e/test_poe2_map_system_e2e.py -v
   - python tools/lint/check_code_and_doc_hygiene.py --strict
4. Write handoff.md in your directory and notify parent when complete.