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Snapshot: fog implementation + fidelity tooling baseline (pre bilinear-clamp fix)

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Per-vertex GS fog end-to-end (gs_stub emit incl. persp_emit5, gs_prim_list_feeder
XYZ2->XYZF2 on PRIM.FGE, gs_make_sh3_scheduler_fixture.py F/FGE packing), new fog
TBs, fidelity attribution tooling. Functional baseline before removing the dead
bilinear lerp8 clamps (Codex: 161-node comb loop -> -0.042ns setup fail).

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
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thejayman77
2026-07-20 19:56:46 -04:00
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CODEX INDEPENDENT VERIFICATION + CLOSE (2026-07-10): Codex re-verified the artifacts himself — RBF sha 9e9c5910
matches board provenance; board FB and fresh zint640 FB share sha256 fd21e43f (cmp clean); replay-color
307200/307200, 0 mismatches, 0 stray. "Call it closed." TWO WORDING CORRECTIONS (precision): hold slack is
exactly 0.000 (met, NOT positive margin); "first-of-its-kind" is a project claim the local evidence cannot
prove — state the verified fact instead: native 640x480 persistent-Z for THIS three-draw strong-reject scene
on silicon, with scanout/texture/writer/depth paths all participating in the proof. NEXT CHAPTER (Codex):
draw-count scaling BEFORE motion — densify toward an SH3 texture cluster while preserving the board-vs-zint
gate.