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feat(codec): PR-X12 v1 — λ-RDO mode selection + rANS entropy coder #211

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AdaWorldAPI merged 3 commits into from
May 27, 2026
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feat(codec): PR-X12 v1 — λ-RDO mode selection + rANS entropy coder #211

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feat(codec): PR-X12 v1 — λ-RDO mode selection + rANS entropy coder
claude May 27, 2026
347f36d
docs(codec): clarify Merge-vs-Delta tie comment per P2 review
claude May 27, 2026
ed6f3ba
fix(codec): reject ANS streams with n>0 but an empty freq table
claude May 27, 2026
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6 changes: 4 additions & 2 deletions .claude/blackboard.md
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Expand Up @@ -34,8 +34,10 @@
## Consolidation-sprint debt (PR-X program; ground-truthed `ls src/hpc/` 2026-05-27)
> Shipped-state vs `pr-master-consolidation.md`. Landed: ✅ **PR-X10** `linalg/`,
> ✅ **PR-X11** `pillar/`, ✅ **PR-X13** `ogit_bridge/`, ✅ **PR-X3** `blocked_grid/`.
- **PR-X12 codec ⚠️ PARTIAL** — `src/hpc/codec/` has `ctu/mode/predict/mod` only;
**RDO + ANS entropy stages missing**. Doc-canon merged (#198/#205), kernel half-built.
- **PR-X12 codec ⚠️ v1 NEAR-COMPLETE** — `ctu/mode/predict` + now **`rdo` (A6, λ-RDO,
integer fixed-point λ_q8 — no float) + `ans` (A7, static-table rANS over the 4-symbol
mode alphabet, bit-exact round-trip)**. Remaining: `transform` (A4, deferred to v2 per
design Q2) + `stream` (A8, framing over `ans`). 81 lib + 20 doctests green, clippy clean.
- **PR-X4 splat4d ❌ OUTSTANDING** — no `src/hpc/splat4d/`. Unbuilt.
- **PR-X9 cognitive ❌ OUTSTANDING** — no `src/hpc/cognitive/`. Unbuilt; must **consume**
`lance-graph-contract::splat::CamPlaneSplat` (q8), never redefine it (contract is sacred).
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