[feat] v2: port the 14 remaining bucket-C archs as self-contained recipe packages
Completes the bucket-C porting backlog. Each arch is a self-contained recipe
package (card-declared torch adapter via ComponentSpec.adapter + a new/forked
loop + program, NO edit to the shared torch_backend dispatch), following the
cosmos2 reference pattern. One _BUCKET_C table in v2/registry.py drives both the
explicit HF-id registry (PRIMARY) and the select_by_architecture fallback.
Ported (CPU-verified: import + card/program build + registry resolve + denoise
loop runs end-to-end on the CPU toy backend; GPU load/run is BRINGUP):
* cosmos25 — Cosmos-Predict2.5 (flow-match, per-frame plain-sigma timestep;
reuse FLOW_MATCH_STEP; Reason1/Qwen2.5-VL encoder adapter)
* hunyuan_video — HunyuanVideo (reuses WanDenoiseLoop; dual LLaMA+CLIP encoders;
Hunyuan VAE scaling_factor) + FastHunyuan variant
* hunyuan_video15 — HunyuanVideo 1.5 (480p/720p cards)
* longcat — LongCat-Video T2V/I2V/VC
* sd35 — SD3.5 MMDiT (flow-match, image; triple-encoder joint embed +
pooled_projections)
* gen3c — GEN3C (EDM; 82ch pose-buffer DiT; camera/depth -> BRINGUP)
* kandinsky5 — Kandinsky 5.0 T2V Lite
* flux2 — FLUX.2 dev/klein (MMDiT, image; gated weights -> BRINGUP)
* stable_audio — Stable Audio Open (audio modality)
* hunyuangamecraft, hyworld, lingbotworld, matrixgame2, matrixgame3 — interactive
world models; t2v/degenerate path CPU-verified, action/camera/
memory conditioning is BRINGUP (needs request-API extension)
Adapters declared via ComponentSpec.adapter (the ac29750b enabler) so each port
adds only NEW files (recipe package + per-arch torch_<arch>.py + optional facade
stub) — zero shared-file edits. Registry resolves all 31 bucket-C HF ids by exact
id + 14 architecture fallbacks; no regression (cosmos2/wan/ltx2 unchanged).
v2 mini green (211 passed, 2 skipped); pre-commit clean (per-file/registry).
SolitaryThinker
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