Mark Backman 457eb7aa92 Mark abstract image/vision generators as real async generators ...

`ImageGenService.run_image_gen` and `VisionService.run_vision` were
declared `async def ... -> AsyncGenerator[Frame, None]` with `pass`
bodies. Without a `yield` anywhere in the body, Python treats the
function as a coroutine returning an `AsyncGenerator`, not as an async
generator itself, so callers got a coroutine where they expected an
iterator.

Add `raise NotImplementedError; yield` so the body contains a yield
(making this a real async generator) while still raising cleanly if a
subclass ever calls `super().run_*` by mistake.

2026-04-22 11:19:23 -04:00

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