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fix(channels): plugin transport survives a daemon child holding stdout
Found in a real-process run (connector package + daemon + plugin in mock mode):
- A plugin that starts its own long-running service hands that service its
stdout write end, so the pipe never reaches EOF after the plugin exits.
Stopping blocked until the service exited (Disconnect hung for minutes) and
a crash went unnoticed. The reader now reads with a timeout
(PipedProcess::read_stdout_for) and the supervisor checks every 200 ms
whether the plugin process itself has exited.
- The plugin reports its status and first inbound messages right after
replying to initialize, sometimes before the initialize result was
processed: callers saw Connected while capabilities were still defaults and
sends failed as not ready. Events that arrive before initialization
completes are now kept in order and replayed once it does.
Tests: PluginTransportTest.StopDoesNotWaitForAChildProcessHoldingThePipe and
CrashIsDetectedWhileAChildProcessHoldsThePipe (fake plugin --spawn-holder),
both failing on the previous code; plugin suites pass 40 repeated runs.
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