Squashed from work; the fine-grained history is under tag archive/work-2026-08-26:
- vj: the tweener learns — RIFE runs on the Mac and feeds the warp
- asset-ai: the chat tells the truth while it works
- llm: a cold turn on the solo slot takes the session-native speculative path — think-mode turns no longer re-ingest the whole conversation through the draft head (66 → 122 tok/s on the four-lane box)
- llm: the step cost model is chosen per device — the RTX PRO 6000's measured verify curve (13.7 + 3.17·B ms) beside the 5090's; the bench warms every tail shape and times two windows
- vj: local store, lyrics and model plumbing, and the frame-interpolator's device parity check
The model code was spread across eight crates that had grown into each other:
ggml and cuda and mlx each owned part of a tensor runtime, llama and tts and
voice2 each owned part of a model, and libs/diffusion owned everything else.
They are now one tree with an explicit shape:
libs/ai/cuda — kernels and launch surface
libs/ai/metal — Metal shaders and the shim
libs/ai/llm — the language-model runtime (sessions, lanes, contexts,
the CUDA and Metal executors, the compiled Metal path)
libs/ai/models/ — common, flux, h3, music, paint, speech, stems, vision
libs/diffusion is not deleted but demoted: what remains is the VALIDATOR
crate — several dozen `*_validate.rs` oracles that check a native
implementation against a reference, which is where they belong now that the
implementations live next door.
The functional work inside the move is mostly in the LLM runtime: N lanes that
draft while one verify batch serves all of them, per-slot prefill over a shared
folded attention arena, speculation that survives batching, and a scheduler
that reports rather than publishes. And in the CUDA build: a machine without
usable CUDA must still LINK (and say so), the default kernel arch is the
building machine's GPU, `NO_CUDA` forces the stub even where the toolkit
exists, and kernels compile in parallel with progress.
libs/video_flow is new here: classical optical flow estimation and the `mkfl`
motion-field payload — a flow field measured from a clip without a model,
which is what drives free-rate bounce-looping playback and the uprez/tween
enhance pipe.
