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

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>
2026-07-20 19:56:46 -04:00
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+# Ch369 Audit Log - Runtime CLUT Mixed-Residency Expansion
+
+## Scope
+
+Extend the Ch368 runtime-CLUT motion content ladder with the native-640x480 28-draw mixed-residency SH3 frame:
+four distinct texture/CLUT rebinds followed by the established eight-epoch shared-texture cluster.
+
+## Fixture Preflight
+
+- `zsrtm28` contains 28 authentic draws in 12 ordered epochs: four single-draw rebinds, then eight 204-triangle
+  shared-texture epochs.
+- Native coordinates remain in bounds at x `35..569`, y `9..400`; every feeder list is within the 2048-word staging
+  capacity.
+- Runtime palette staging is enabled for every epoch. The candidate is simulation-only until request pressure and
+  exact Z/color scoreboards pass at the Ch368 production depth.
+
+## Integration Gate
+
+- The full 12-epoch runtime-CLUT integration passes at request depth 4096: 465,250 accepted fragments, 214,897
+  persistent-Z updates, 12 fresh drains, zero drops, Z `0/307200`, and color `0/110324`.
+- Per-epoch request-FIFO high-water values are 1895, 1468, 110, 432, 797, 85, 650, 381, 184, 1669, 616, and 1125.
+  The measured maximum is 1895, so the Ch368 core requires no RTL, timing, or fit change for this candidate.
+
+## Silicon Closure
+
+- The board host gate passes all 12 epochs: four texture fills/rebinds, eight resident reuses, twelve runtime palette
+  copies, fresh ordered drains, and zero fragment drops.
+- Board and integration framebuffers are byte-identical at SHA-256
+  `fdff2f34eac22ee140b64d8fac129627549bbb0f6db37d4b91807a9058e47a04`.
+- Replay-color is exact at `307200/307200`: 465,250 fragments, 214,897 Z-pass updates, 110,324 covered pixels, and
+  no stray uncovered writes.
+
+## Result
+
+Ch369 is closed on silicon: 28 authentic SH3 draws at native 640x480 with runtime CLUT updates, four real texture
+rebinds, persistent Z, and exact board/simulation/replay agreement, all on the Ch368 core with no further fit.
+
+## Mixed-Residency Motion Extension
+
+- The same core ran `zsrtm28 -> zsrtb24 -> zsrtm28 -> zsrtb24`, resetting color/Z and staging the appropriate
+  textures and runtime palettes for every frame boundary. All 40 epoch drains were fresh and all drop gates stayed
+  zero.
+- The four boundary dumps alternate exactly: mixed-residency dumps 0 and 2 equal
+  `fdff2f34eac22ee140b64d8fac129627549bbb0f6db37d4b91807a9058e47a04`; adjacent-frame dumps 1 and 3 equal
+  `3191d75983e72a158f91f15cc1f57b6ff7c5e40d5bbb4a49957db06db4e2fded`. Each matches its independently closed
+  integration framebuffer byte-for-byte.