Margin rung M1 (ROADMAP 3-A4i D5 tail, item (f) - suspect CONFIRMED by code:
erase_clt_tiles NaN-fills the full 16x5120x256-float CLT buffer (~84 MB)
every cycle while the chain converts/reads only the 150 task tiles):
- new erase_clt_task_tiles(_inner): poison ONLY the task-listed tiles
  (~2.4 MB) - task-tile bytes identical to the full erase (a task tile that
  fails conversion stays NaN), non-task tiles keep stale data no pose-chain
  consumer reads (consolidation/inter-corr/peaks are all task/index-driven).
- pose_measure chain (tp_lma.cu) switches to it; the full-frame
  erase_clt_tiles stays UNCHANGED for every render/debug/legacy path.
- module function list +1 (Java Stage0 41/41 in the main-repo commit).
Gates: run_cases.sh ALL PASS (pose_corr @tol 0 = captured production data
bit-identical through the list-erase chain; scene_dp/scene_dp_split/
measure_dp bit-identical); sanitizer 0 errors. A/B microbench: chain 2.52 ->
~2.35 ms/cycle => ~0.6-0.8 ms/scene off the DP entry.
Co-authored-by: Claude Opus 4.8 <claude-opus-4-8@anthropic.com>
Co-authored-by: Claude Fable 5 <claude-fable-5@anthropic.com>