Recognize vite strictPort exits as port collisions in claimAndBoot

[RhysSullivan]

Sixth CI e2e flake from PR #1648's runs: a cloud shard died at boot with BootProcessExitError — vite --strictPort exited with "Port 44550 is already in use".

The boot glue already handles exactly this: claimAndBoot bind-probes a port block and, on a collision between probe release and the service's bind (a Linux ephemeral outbound socket can grab the port in that window), re-claims the next block and retries. But the retry only engages when isAddrInUse recognizes the failure, and vite's strictPort exit never says EADDRINUSE — the CLI catches the bind error and dies with "Port N is already in use", which reaches the setup only inside the boot log tail. So the retry never fired and the shard failed on attempt 1.

isAddrInUse now also matches that phrasing (verified against the exact error shape from the failed run: detected, and unrelated boot failures still are not).

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