- uniformMotionBlur: representative = defined reference tile nearest the frame
  center passing getMotionBlur's own gates (mirrored locally; the synthetic
  averaged frame-center point failed SILENTLY on every scene in the 07/12 run).
  Degenerate fallback now prints the tried point + rates (self-explaining).
- leanFitScene: per-scene 'CuasPoseRT cycles: ... dATR/cycle = ...' trace line
  (fixed AND legacy modes) - the convergence-trajectory data for the open
  'why does azimuth need so many cycles' investigation (3 cycles: az RMS
  0.5209; 6 cycles: 0.1805; legacy baseline: 0.1355 px).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>