Design 3-A4i rung C3 (Andrey 07/17: weights and their normalization once
per scene, not every cycle - re-normalizing on each cycle's re-measurement
makes the solver conditioning wobble with measurement noise while the
information is a per-scene property):
- pose_lma_assemble/pose_lma_prepare_finish gain a 'light' mode: cycle-1
  conditioning (weights/eigen/selection/pull/reg/pure_weight) is FROZEN;
  light cycles write only the fresh measured offsets into the frozen
  structure and add fx (a frozen-selected tile with no fresh valid peak
  abstains: y=fx, zero residual, normalization untouched).
- tp_proc_exec_pose_lma_prepare_resident(int light): guarded by
  pose_prep_frozen_tiles (a full prepare at this tile count must precede);
  light memsets only the measured y region, skips group/pull/reg uploads,
  skips the norm tail and diag/reg/normalize, skips the compact-result D2H.
- Direct test: new LIGHT case (fresh peaks incl. abstains + moved fx) -
  y bit-exact vs serial float oracle, weights/eigen bit-identical frozen.
Gates: direct full+LIGHT bit-exact, NVRTC resident + 19-float, pose_corr
@tol 0, sanitizer 0 errors.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>