Widen the stdio round-trip test's termination grace and overall timeout (#2880)

tests/interaction/transports/test_stdio.py

@@ -61,8 +61,10 @@ async def test_tool_call_and_notification_round_trip_over_a_stdio_subprocess(
     # post-print kill can no longer silently lose the data file -- see _stdio_server.main). The
     # production 2s default is too tight for the unwind+save tail on loaded Windows runners
     # (measured in-situ p99 of the whole test is ~7s); a kill before the print fails the stderr
-    # assertion below loudly rather than tripping the coverage gate. Not under test.
-    monkeypatch.setattr(stdio, "PROCESS_TERMINATION_TIMEOUT", 10.0)
+    # assertion below loudly rather than tripping the coverage gate. The 20s grace covers even a
+    # badly starved runner (a >10s stall has been seen once in CI) and costs nothing when the
+    # child exits promptly. Not under test.
+    monkeypatch.setattr(stdio, "PROCESS_TERMINATION_TIMEOUT", 20.0)
 
     received: list[LoggingMessageNotificationParams] = []
 
@@ -85,8 +87,8 @@ async def test_tool_call_and_notification_round_trip_over_a_stdio_subprocess(
             errlog=errlog,
         )
 
-        # Must exceed session time plus the patched PROCESS_TERMINATION_TIMEOUT (10s).
-        with anyio.fail_after(20):
+        # Must exceed session time plus the patched PROCESS_TERMINATION_TIMEOUT (20s).
+        with anyio.fail_after(30):
             async with Client(transport, logging_callback=collect) as client:
                 assert client.initialize_result.server_info.name == "stdio-echo"
                 result = await client.call_tool("echo", {"text": "across\nprocesses"})