whereat: zero error-location capture in Viterbi/median-cut/dither state machines
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Description
Audit (2026-06-14): captures **0/24** error locations. Plain thiserror enum, no location field, all origins bare `Err`. Untagged state machines: Viterbi DP scanline opt (remap.rs), joint PNG-filter DP, joint LZ77 Huffman tree, median-cut quantization, dither error-diffusion. Remediation (breaking — Result→At) → batch into next 0.x; pairs with the pixel-cap work in zenquant#5. Tracking: PRODERRDOC_WHEREAT_COVERAGE_2026-06-14.md.
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