# Progress Tracker — worker_core_1

**Last visited**: 2026-10-04T09:32:00Z
**Current Status**: All implementation tasks, wiring, tests, and hygiene completed. Writing handoff.

## Milestones & Checklist
- [x] Step 0: Context ingestion, briefings, surveys, and project architecture inspection
- [x] Step 1: Implement `server/stats/stat_types.py` (187 lines, < 200 lines)
- [x] Step 2: Implement `server/stats/formula_persistence.py` (163 lines, < 250 lines)
- [x] Step 3: Implement `server/stats/stat_aggregator.py` (329 lines, < 350 lines)
- [x] Step 4: Run blast radius ack for `server/world/server_engine_loop.py` and implement wiring (292 lines)
- [x] Step 5: Implement `server/stats/__init__.py` (35 lines)
- [x] Step 6: Create `tests/unit/test_character_stat_aggregator.py` (221 lines, 12 non-trivial tests)
- [x] Step 7: Run pytest test suites (33/33 tests pass in 1.05s, 45/45 dependent tests pass in 1.56s)
- [x] Step 8: Run `python tools/lint/check_code_and_doc_hygiene.py --strict` (100% compliance with hard & soft caps)
- [x] Step 9: Write comprehensive `handoff.md` and notify parent