[krunkosaurus]

Description and motivation

Part 2 of 3. Depends on #26; merge that first, then this PR, then #28. The incremental recipe change is 37a6832...cb20bda.

Expose per-request temperature, top_p, top_k and exact unsigned 64-bit seed in all three pinned engines without changing their pins or default settings. Add full-model patches 0013/0014, Metal NVFP4 patches 0004/0005, and CUDA NVFP4 patch 0002, each with exact checksum coverage. Source companions: modern #1277 and legacy CUDA #6.

Validation happens before engine submission. Tests inspect the actual sampler fields sent through whole/streamed requests, reference rebuilding, CFG and redraws. Explicit seeds retain all 64 bits; redraws add their take ordinal with wrapping arithmetic. Legacy long-form applies that policy separately to each segment. Documentation states the existing JSON-f64 underflow boundary and native sampler differences.

The public Sogni-AI/drama3-mlx API is the behavioral reference. Native Zig changes were implemented independently.

Testing

• scripts/build-engine.sh reapplies the complete selected series from each clean pin: full-model 66/66 build steps and Metal NVFP4 73/73 build steps passed on macOS arm64 with Zig 0.17.0. Native server and selected voice tools compile. Applied trees exactly equal reviewed source commits 1c31b4d2 and 2af18fba.
• CUDA exported series applies from clean b1f4b9b4; tree equals reviewed 22939c2a. Exact exported-tree CPU suite: 371/375 passed, four skipped.
• Final exact-export server reruns: full-model 574/574 passed; Metal 745/748 passed, three skipped. The five-test JSON target was cached from its earlier passing run; all five build steps passed per profile.
• Modern source regression suite: 742/745 server tests passed, three skipped; JSON target passed/cached. Four route tests fail before the implementation.
• Recipe Python suite inherited from [1/3] Preserve speech controls and CJK boundaries in long-form chunks #26: 46 tests, 15 skipped, zero failures. All 21 selected patch files have valid digests and exact unique manifest coverage.
• Independent adversarial agent source and final packaging reviews passed after fixing the parsed-f64 documentation boundary. No new native lean findings; applied-source and non-patch recipe whitespace checks pass.
• Broader modern source checks encountered two unchanged macOS base failures: test-pull-host aborts with ISCONN, and tf-flashnext-run fails on SharedEvent/Event. Both reproduce on the untouched base; this is not a passing whole-upstream build claim.
• CUDA host compilation on this Mac hits the unchanged base's O.DIRECT portability error. Real CUDA compilation, model/audio identity, device determinism, listening and qualification gates remain unrun. The local launcher memory admission floor was not met and was not overridden. This PR remains a draft.

During final CPU replays, two unchanged recall tests failed while the volume had about 3.3 GiB free, below their existing 4 GiB admission floor. Removing only task-created compiler caches restored 5.043 GiB; the identical commands passed with no source, environment or admission-guard change. Original failure receipts were retained.

Performance or quality claim

None. Equal settings do not promise equal audio across native backends.

Checklist

• Ordered appended patches, checksums, patch index and source links updated.
• Clean series application and real full-model/Metal recipe builds.
• Deterministic regressions and independent adversarial agent review.
• No weights, private voices, recordings or private machine paths published.
• CUDA build/device and real-model/audio qualification.

[plotarmordev]

Thanks! The validation and the seed handling look right to me, and requests without the new fields keep exactly the old seeds and parameters. One non-blocking ask for TensorFold #6 (and so CUDA patch 0002): after this change Redraws.salt in zig/src/server/speech_redraw.zig no longer has any callers. Could you drop it and re-export 0002 with its new checksum? Separately, I've decided to keep these fields request-level with no launch flag, since requests without them behave exactly as before. I'll push a small README commit to your branch that lists them as a stated exception to the "answers as upstream does without flags" rule.

[plotarmordev]

My CUDA checks for #27 pass: seeds repeat byte for byte (including 2^53+1 and 2^64-1), out-of-range top_k is rejected with a 400, and requests without the new fields are byte-identical to the merge base on both weight sets.

From my side this is ready. Please mark it ready for review whenever you're happy, and I'll merge it right after #26. The small README and patch-subject touch-ups for #28 I mentioned earlier I'll add once this one is in.