- _augment_tracks: default random 1000-2500 track sampling (was 1-200), contiguous
chunk masking (was per-frame), diversity weighting (favor moving/unique tracks,
keep some static), and an object-coverage hook (>=1 track per SAM segment via
optional object_ids). Sampling ON by default; CFG dropout now default off.
- trackwan_infer.generate: motion classifier-free guidance (guidance_scale) using
the base no-tracks I2V branch as the unconditional.
- test_motion_cfg.py: quick guidance-scale EPE sweep.
- finetune_wantrack_wan200.yaml: 50->200 data-scale run (same params).
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