stacklok / toolhive / 21706693560

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Fix proxy hang on kubectl attach EOF (#3584)

The proxy could hang indefinitely when kubectl attach terminated
its SPDY connection. This occurred because:

- SPDY executor retained corrupted state across retry attempts
- Pipe cleanup wasn't signaling EOF to the transport layer

Create fresh SPDY executor per retry to avoid state corruption.
Close pipes when attach goroutine exits to propagate EOF signal,
allowing the transport layer to detect the failure and trigger
re-attachment or exit.

Fixes: #3583

Signed-off-by: Robert Dailey <git@rdailey.me>

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