Will Lin 1cb2b4e84c [feat] v2: per-model sampling defaults on ModelCard (Phase 1a) ...

v2 had no per-model defaults — generate_video hardcoded 30 steps/25 frames/480x832/cfg5/16fps for
every model, badly wrong for e.g. LTX-2 distilled (wants 8 steps @1024x1536) or Wan2.2-TI2V (704x1280@24fps).

- New SamplingDefaults dataclass + ModelCard.sampling_defaults (v2/card/specs.py), exported from v2.card.
- Populated all 7 supported cards from fastvideo's InferencePreset defaults (steps/guidance/HxW/frames/fps
  + per-modality guidance for LTX-2.3 A/V). Negative prompts copied verbatim into v2/recipes/_prompts.py
  (recipe DATA, not model code -> v2-owned, no fastvideo import).
- VideoGenerator stores the resolved card; generate_video applies card defaults with precedence
  kwargs > SamplingParam > card > generic fallback (pure _resolve_default helper, unit-tested).
- test_sampling_defaults.py: per-card values + precedence (incl. empty-neg-prompt edge). CPU mini 210 pass, 2 skip.

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..

test_adapters.py

[refactor] v2: rename models/ (recipe layer) -> recipes/; move toy backend -> platform/backends/toy.py

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test_adaptive_compute.py

[refactor] v2: rename models/ (recipe layer) -> recipes/; move toy backend -> platform/backends/toy.py

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test_admission.py

[refactor] v2: rename models/ (recipe layer) -> recipes/; move toy backend -> platform/backends/toy.py

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test_cache.py

[refactor] v2: rename models/ (recipe layer) -> recipes/; move toy backend -> platform/backends/toy.py

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test_contracts.py

[refactor] v2: rename models/ (recipe layer) -> recipes/; move toy backend -> platform/backends/toy.py

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test_cudagraph.py

[refactor] v2: rename models/ (recipe layer) -> recipes/; move toy backend -> platform/backends/toy.py

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test_extensions.py

[refactor] v2: rename models/ (recipe layer) -> recipes/; move toy backend -> platform/backends/toy.py

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test_flywheel.py

[refactor] v2: rename models/ (recipe layer) -> recipes/; move toy backend -> platform/backends/toy.py

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test_inference.py

[refactor] v2: rename models/ (recipe layer) -> recipes/; move toy backend -> platform/backends/toy.py

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test_interleave_gate.py

[refactor] v2: rename models/ (recipe layer) -> recipes/; move toy backend -> platform/backends/toy.py

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test_joint_multi_rl.py

[refactor] v2: rename models/ (recipe layer) -> recipes/; move toy backend -> platform/backends/toy.py

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test_ltx2_av.py

[refactor] v2: rename models/ (recipe layer) -> recipes/; move toy backend -> platform/backends/toy.py

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test_nested_workflow.py

[refactor] v2: rename models/ (recipe layer) -> recipes/; move toy backend -> platform/backends/toy.py

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test_omni.py

[refactor] v2: rename models/ (recipe layer) -> recipes/; move toy backend -> platform/backends/toy.py

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test_parity.py

[refactor] rename package mini_fastvideo → v2

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test_platform.py

[refactor] v2: rename models/ (recipe layer) -> recipes/; move toy backend -> platform/backends/toy.py

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test_policies.py

[refactor] rename package mini_fastvideo → v2

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test_review_fixes.py

[refactor] v2: rename models/ (recipe layer) -> recipes/; move toy backend -> platform/backends/toy.py

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test_sampling_defaults.py

[feat] v2: per-model sampling defaults on ModelCard (Phase 1a)

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test_served_reward.py

[refactor] v2: rename models/ (recipe layer) -> recipes/; move toy backend -> platform/backends/toy.py

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test_serving_fixes.py

[refactor] v2: rename models/ (recipe layer) -> recipes/; move toy backend -> platform/backends/toy.py

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test_serving.py

[refactor] v2: rename models/ (recipe layer) -> recipes/; move toy backend -> platform/backends/toy.py

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test_speculative.py

[refactor] v2: rename models/ (recipe layer) -> recipes/; move toy backend -> platform/backends/toy.py

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test_t2i_i2v_workflow.py

[refactor] v2: rename models/ (recipe layer) -> recipes/; move toy backend -> platform/backends/toy.py

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test_thinker_talker.py

[refactor] v2: rename models/ (recipe layer) -> recipes/; move toy backend -> platform/backends/toy.py

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test_tiled_scheduling.py

[refactor] v2: rename models/ (recipe layer) -> recipes/; move toy backend -> platform/backends/toy.py

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test_torch_backend.py

[refactor] v2: rename models/ (recipe layer) -> recipes/; move toy backend -> platform/backends/toy.py

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test_training.py

[refactor] v2: rename models/ (recipe layer) -> recipes/; move toy backend -> platform/backends/toy.py

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test_unified_rl.py

[refactor] v2: rename models/ (recipe layer) -> recipes/; move toy backend -> platform/backends/toy.py

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test_weight_sync_live.py

[refactor] v2: rename models/ (recipe layer) -> recipes/; move toy backend -> platform/backends/toy.py

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test_workflow_rl.py

[refactor] v2: rename models/ (recipe layer) -> recipes/; move toy backend -> platform/backends/toy.py

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test_workflow_shapes.py

[refactor] v2: rename models/ (recipe layer) -> recipes/; move toy backend -> platform/backends/toy.py

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test_world_session.py

[refactor] v2: rename models/ (recipe layer) -> recipes/; move toy backend -> platform/backends/toy.py

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