Fix pyrefly type errors in __init__.py and ltx_chan.py

[Copilot]

The build (3.9) CI job was failing because pyrefly check reported 2 type errors that weren't being properly suppressed.

Changes

• libkirk/__init__.py: The pyrefly suppression comment for the deprecated asyncio.gather(..., loop=loop, ...) call used the wrong error code (bad-argument-type). Pyrefly reports this as no-matching-overload since its stubs omit the removed loop parameter entirely. Updated the ignore directive accordingly:

  # pyrefly: ignore[no-matching-overload]
  asyncio.gather(*tasks, loop=loop, return_exceptions=True)

• libkirk/channels/ltx_chan.py: In stop(), the untyped requests = [] list was inferred as list[Requests.kill] — which, due to list invariance, is not assignable to the list[Request] parameter of _send_requests(). Added an explicit annotation to declare the intended type upfront:

  requests: List[Request] = []