fix(render): glyph surgery so Spleen 5x8 K no longer reads as H - #127
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The stock Spleen K was H with one crossbar pixel removed (Hamming 1), the worst confusable pair in the atlas. Because the API downscales images and the model infers rather than scans, that difference vanishes and K is silently misread as H - with no signal of uncertainty. gen-atlas.ts now repaints K with a diagonal-legged bitmap: Hamming 8 from H, and >=6 from every other ASCII glyph. Scoped to the narrow Spleen 5x8 primary cell, so the JetBrains-Mono and CJK-fallback atlases are untouched. Zero token-cost change - the glyph occupies the same 5x8 box. Guarded by a regression test asserting no alphanumeric pair sits below Hamming 2. Reproduce with: npx tsx eval/glyph-matrix/demo-glyph.mts Closes the "optional glyph surgery" item in the 2026-07-01 legibility audit.
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The stock Spleen K was H with one crossbar pixel removed (Hamming 1), the worst confusable pair in the atlas. Because the API downscales images and the model infers rather than scans, that difference vanishes and K is silently misread as H - with no signal of uncertainty.
gen-atlas.ts now repaints K with a diagonal-legged bitmap: Hamming 8 from H, and >=6 from every other ASCII glyph. Scoped to the narrow Spleen 5x8 primary cell, so the JetBrains-Mono and CJK-fallback atlases are untouched. Zero token-cost change - the glyph occupies the same 5x8 box.
Guarded by a regression test asserting no alphanumeric pair sits below Hamming 2. Reproduce with: npx tsx eval/glyph-matrix/demo-glyph.mts
Closes the "optional glyph surgery" item in the 2026-07-01 legibility audit.