Add back loose-tn in `gather_contexts()`, mk tests green

tractor/trionics/_mngrs.py

@@ -154,7 +154,7 @@ async def gather_contexts(
     async with (
         # collapse_eg(),
         trio.open_nursery(
-            # strict_exception_groups=False,
+            strict_exception_groups=False,
             # ^XXX^ TODO? soo roll our own then ??
             # -> since we kinda want the "if only one `.exception` then
             # just raise that" interface?

tractor/trionics/_taskc.py

@@ -60,8 +60,8 @@ def find_masked_excs(
     return None
 
 
-# XXX, relevant ish discussion @ `trio`-core,
-# https://github.com/python-trio/trio/issues/455#issuecomment-2785122216
+# XXX, relevant discussion @ `trio`-core,
+# https://github.com/python-trio/trio/issues/455
 #
 @acm
 async def maybe_raise_from_masking_exc(
@@ -113,7 +113,6 @@ async def maybe_raise_from_masking_exc(
     )
     matching: list[BaseException]|None = None
     maybe_eg: ExceptionGroup|None
-    maybe_eg: ExceptionGroup|None
 
     if tn:
         try:  # handle egs