feat(engine): scene-level generation API (generate_clip / generate_keyframe)#35
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…yframe) Exposes the engine at per-scene granularity so callers can render/regenerate one scene at a time and chain seamlessly (pass the previous clip's last_frame_path as the next scene's first frame → i2v), instead of only the autonomous Pipeline.run(). Same engine, finer control — for interactive tools (incl. the managed studio) and self-hosters who want per-scene control. - Generator.generate_clip(prompt, *, scene_id, camera, characters, first_frame_path) - KeyframeGenerator.generate_keyframe(prompt, output_path) - tests + README 'Use it as a library' section.
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Why
The engine could only be driven autonomously via `Pipeline.run()` (whole shot list in one shot). Interactive tools — the managed studio, and self-hosters who want to regenerate a single scene — need per-scene control. This exposes the existing generation primitives as a clean public API without changing the autonomous path.
What
This is the foundation for the managed service to run the open core at scene granularity (interactive refinement) rather than maintaining a parallel generation path. Same engine, finer control.
Full suite: 22 passed. `ruff` clean.