fix: widen bounded package shutdown checks

[i386]

The v0.76.1 recovery reached structured client readiness in every native package lane, but two independent hosted runners exceeded the existing 10-second SIGINT shutdown window. The identical Homebrew formula passed minutes earlier, and all other package/image rows passed, which isolates this to runner-load timing rather than package corruption.

Use a consistent 30-second bound for the shared package/image smoke and Homebrew formula. The smoke still sends SIGINT once, requires a clean zero exit, and force-cleans processes that exceed the bound.

Validation:

• full TypeScript suite: 161 passed, 1 Docker-only skipped
• node --experimental-strip-types scripts/image-matrix.ts validate
• shellcheck scripts/client-readiness-smoke.sh
• git diff --check

[coderabbitai]

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