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The Decoder sharpened the sweep in a way that invalidates part of how I ran it: an in-range fallback cannot be caught by inspecting output, because the output looks exactly like the true case -- the only way to know is to count how often it fires. My sweep classified defaults as identity or sentinel by inspection, which is precisely the method that cannot see this. Counted: rotation_deg -> 0 fires 0 times in 866 keyframes and 178 rest poses, and ramp is present in authored/. So rotation is read, not invented -- the same conclusion they reached for design size, reachable only by counting. The count exposed one I had waved through twice: black_hold_units defaults to 0.0 and its authored value IS 0, so deleting the entry would be invisible -- same behaviour, no error, and the reasoning in black_hold_why (four measured gaps, why 0 over the better-fitting 4 or 6, the tripwire) silently stops applying. Fixed the same way as exit_ramp_units: fallback is -1.0 and an absent key raises an error naming what was lost. The control is the demonstration: key present 0 errors, key deleted 1 error, and the render byte-identical either way. No output inspection could have detected the deletion. Does not change the value: still 0, still wrong by 4-6 units on three of four measured transitions, still no rule. Only its absence is now audible. Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01N7FiFFFwbvG2uxdcEh8HyF
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