fix: preserve signal exit code on Unix#2154
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The N-API command path used ExitStatus::code directly, so signal-terminated children were collapsed to exit code 1. Reuse a shared shell-compatible conversion and guard SIGILL as exit code 132.
Process exit statuses were converted independently across Rust and Node runners, so signal-terminated children became generic failures or even successes. Centralize Rust conversion, map Node signal names to 128 + signal, and cover SIGILL in both runner modes.
Let the snapshot runner and vpt helper depend on vite_shared so both use the canonical Unix signal-to-exit-code conversion instead of maintaining duplicate implementations.
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In the current codebase, there are a lot of places where we simply use
result.status.code().unwrap_or(1)to handle the exit code.However, according to Rust std docs, if the process is terminated by a signal, the
status.code()will becomeNoneon Unix. We should readExitStatusto know the signal and get the real exit code.This PR fixes them.
Partially related to #2041.