Use `chan: LinkedTaskChannel` API in all aio-task fns

Convert every remaining `to_trio`/`from_trio` fn-sig style
to the new unified `chan: LinkedTaskChannel` iface added in
prior commit (c46e9ee8).

Deats,
- `to_trio.send_nowait(val)` (1st call) -> `chan.started_nowait(val)`
- `to_trio.send_nowait(val)` (subsequent) -> `chan.send_nowait(val)`
- `await from_trio.get()` -> `await chan.get()`

Converted fns,
- `sleep_and_err()`, `push_from_aio_task()` in
  `tests/test_infected_asyncio.py`
- `sync_and_err()` in `tests/test_root_infect_asyncio.py`
- `aio_streamer()` in
  `tests/test_child_manages_service_nursery.py`
- `aio_echo_server()` in
  `examples/infected_asyncio_echo_server.py`
- `bp_then_error()` in `examples/debugging/asyncio_bp.py`

Also,
- drop stale comments referencing old param names.

(this patch was generated in some part by [`claude-code`][claude-code-gh])
[claude-code-gh]: https://github.com/anthropics/claude-code

examples/debugging/asyncio_bp.py

@@ -18,15 +18,14 @@ async def aio_sleep_forever():
 
 
 async def bp_then_error(
-    to_trio: trio.MemorySendChannel,
+    chan: to_asyncio.LinkedTaskChannel,
-    from_trio: asyncio.Queue,
 
     raise_after_bp: bool = True,
 
 ) -> None:
 
     # sync with `trio`-side (caller) task
-    to_trio.send_nowait('start')
+    chan.started_nowait('start')
 
     # NOTE: what happens here inside the hook needs some refinement..
     # => seems like it's still `.debug._set_trace()` but

examples/infected_asyncio_echo_server.py

@@ -11,21 +11,17 @@ import tractor
 
 
 async def aio_echo_server(
-    to_trio: trio.MemorySendChannel,
+    chan: tractor.to_asyncio.LinkedTaskChannel,
-    from_trio: asyncio.Queue,
-
 ) -> None:
 
     # a first message must be sent **from** this ``asyncio``
     # task or the ``trio`` side will never unblock from
     # ``tractor.to_asyncio.open_channel_from():``
-    to_trio.send_nowait('start')
+    chan.started_nowait('start')
 
-    # XXX: this uses an ``from_trio: asyncio.Queue`` currently but we
-    # should probably offer something better.
     while True:
         # echo the msg back
-        to_trio.send_nowait(await from_trio.get())
+        chan.send_nowait(await chan.get())
         await asyncio.sleep(0)
 
 

tests/test_child_manages_service_nursery.py

@@ -18,16 +18,15 @@ from tractor import RemoteActorError
 
 
 async def aio_streamer(
-    from_trio: asyncio.Queue,
+    chan: tractor.to_asyncio.LinkedTaskChannel,
-    to_trio: trio.abc.SendChannel,
 ) -> trio.abc.ReceiveChannel:
 
     # required first msg to sync caller
-    to_trio.send_nowait(None)
+    chan.started_nowait(None)
 
     from itertools import cycle
     for i in cycle(range(10)):
-        to_trio.send_nowait(i)
+        chan.send_nowait(i)
         await asyncio.sleep(0.01)
 
 

tests/test_infected_asyncio.py

@@ -47,12 +47,11 @@ async def sleep_and_err(
 
     # just signature placeholders for compat with
     # ``to_asyncio.open_channel_from()``
-    to_trio: trio.MemorySendChannel|None = None,
+    chan: to_asyncio.LinkedTaskChannel|None = None,
-    from_trio: asyncio.Queue|None = None,
 
 ):
-    if to_trio:
+    if chan:
-        to_trio.send_nowait('start')
+        chan.started_nowait('start')
 
     await asyncio.sleep(sleep_for)
     assert 0
@@ -399,7 +398,7 @@ async def no_to_trio_in_args():
 
 async def push_from_aio_task(
     sequence: Iterable,
-    to_trio: trio.abc.SendChannel,
+    chan: to_asyncio.LinkedTaskChannel,
     expect_cancel: False,
     fail_early: bool,
     exit_early: bool,
@@ -407,15 +406,12 @@ async def push_from_aio_task(
 ) -> None:
 
     try:
-        # print('trying breakpoint')
-        # breakpoint()
-
         # sync caller ctx manager
-        to_trio.send_nowait(True)
+        chan.started_nowait(True)
 
         for i in sequence:
             print(f'asyncio sending {i}')
-            to_trio.send_nowait(i)
+            chan.send_nowait(i)
             await asyncio.sleep(0.001)
 
             if (
@@ -1109,13 +1105,12 @@ async def raise_before_started(
 ) -> None:
     '''
     `asyncio.Task` entry point which RTEs before calling
-    `to_trio.send_nowait()`.
+    `chan.started_nowait()`.
 
     '''
     await asyncio.sleep(0.2)
     raise RuntimeError('Some shite went wrong before `.send_nowait()`!!')
 
-    # to_trio.send_nowait('Uhh we shouldve RTE-d ^^ ??')
     chan.started_nowait('Uhh we shouldve RTE-d ^^ ??')
     await asyncio.sleep(float('inf'))
 

tests/test_root_infect_asyncio.py

@@ -91,13 +91,12 @@ def test_infected_root_actor(
 async def sync_and_err(
     # just signature placeholders for compat with
     # ``to_asyncio.open_channel_from()``
-    to_trio: trio.MemorySendChannel,
+    chan: tractor.to_asyncio.LinkedTaskChannel,
-    from_trio: asyncio.Queue,
     ev: asyncio.Event,
 
 ):
-    if to_trio:
+    if chan:
-        to_trio.send_nowait('start')
+        chan.started_nowait('start')
 
     await ev.wait()
     raise RuntimeError('asyncio-side')