Worker: with loop true the answer gains loops (one {first, last, poseCost, velocityCost}
per sample) from loop_window over Kimodo's somaskel77 posed joints and compute_global_heading.
Daemon: loop must be a boolean and needs fbx (400 'Invalid fbx request.'); sample k is
exported with '--frames first+1 last+1'; an answer without a window for a sample fails
'fbx-export-failed (no loop window)'; the record keeps request.loop and, when inline,
the constraints as sent. The daemon never computes a window.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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