viyatb-oai bf3eb2ec91
Prevent Unix PTY I/O from blocking runtime shutdown ( #40460 ) ...
## Why
Blocking PTY reads and output-channel sends can keep Tokio runtime shutdown
waiting when a detached child retains the terminal or output backpressure fills
the channel.
## What changed
- Drive Unix PTY reads and writes through nonblocking `AsyncFd` readiness so
their tasks can be cancelled during shutdown.
- Keep draining child output after its receiver closes, and preserve queued
input plus EOF delivery when portable PTY stdin closes.
- Return a descriptive error when PTY spawning uses a Tokio runtime without an
I/O driver.
## Testing
Add Unix coverage for detached children, full and dropped output channels,
large input with EOF, inherited file descriptors, and runtimes without I/O.
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viyatb-oai
bf3eb2ec91