Fix type hints for EchoReader callbacks

[Copilot]

depth_callback was annotated as Callable[[dict], Coroutine] but invoked with a float, causing mypy errors and misleading callers. Coroutine return types were also left bare (no type parameters).

Changes

• depth_callback: Callable[[dict], Coroutine] → Callable[[float], Coroutine[Any, Any, None]]
• data_callback: Callable[[dict], Coroutine] → Callable[[dict], Coroutine[Any, Any, None]]
• Added from typing import Any

class EchoReader:
    def __init__(
        self,
        data_callback: Callable[[dict], Coroutine[Any, Any, None]],
        depth_callback: Callable[[float], Coroutine[Any, Any, None]],
        ...
    ):

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