Wrap `os.unlink()` in `close_listener()` with a `FileNotFoundError`
guard — under concurrent pytest sessions the sock-file can already be
reaped. Without this the raise aborts `_serve_ipc_eps`'s finally before
`_shutdown.set()`, deadlocking `wait_for_shutdown()` on
`actor.cancel()`.
Also,
- close each endpoint independently in the finally so one raise doesn't
strand the rest.
- always signal `_shutdown.set()` regardless of remaining ep count.
(this commit msg was generated in some part by [`claude-code`][claude-code-gh])
[claude-code-gh]: https://github.com/anthropics/claude-code
(cherry picked from commit 2ee44a6fdd)
Gud Boi
bdf0fb0a2e