Oracle (clt_aberrations_quad_corr_GPU) needs the texture path that RT did not:
execTextures (calc_extra -> diff_rgb_combo, calc_textures -> textures),
getTextureIndices, getExtra, getFlatTextures.

Adds to TpProc:
- texture buffers (lazy-allocated in tp_proc_ensure_textures; sizes match
  GpuQuad: max_texture_size=(num_colors+1+(num_cams+num_colors+1))*256)
- tp_proc_exec_textures: textures_nonoverlap<<<1,1>>> mirroring
  GpuQuad.execTextures_DP. The kernel CDP-builds the index list internally
  (create_nonoverlap_list) so we do NOT host pre-fill it, and CDP-launches
  textures_accumulate (dyn-shared attr set on the accumulate fn). linescan_order
  is taken from the caller (0 in production -> diff_rgb_combo in texture_indices
  order). This matches PRODUCTION, not the Stage-5 harness convention (linescan=1
  + host-prefilled indices + stale golden) that produced the documented
  diff_rgb_combo mismatch.
- tp_proc_get_texture_indices / get_diff_rgb_combo / get_textures readback.

Native compiles clean (4 new symbols exported). Not yet deployed: live .so
left untouched (run was active); rebuild via jna/build_lib.sh when free.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>