refactor: consolidate counting config through src/config_loader
- config.yaml gains counting.max_reid_frames (200) + debounce_frames (8);
CountingConfig + parsing + pinned-value test added
- predict.py load_zones() delegates to read_zone_polygons() (geometry only);
legacy zones.json knob reads removed (config.yaml is canonical)
- run_prediction wires 5 more live knobs from cfg.counting.* (entry/exit
overlap, tolerance_missing_frames, max_reid_frames, debounce_frames)
- delete deprecated src/config.py (v3 keys) + tests/test_config.py;
src/main.py bridges onto unified config so the deprecated entrypoint
keeps working
- 8 never-read globals (JARAK_ABSORBSI_GHOST, CAMERA_NOISE_DEADBAND, ...)
left untouched — flagged for Phase 2 dead-code cleanup
Verified: pytest 21 passed; full pipeline runs on synthetic video
(engines load, 30 frames, clean finish).
andrew
12b70a3431