test: parallelize setup cases

[chenjiahan]

This PR splits the setup installation tests into four focused files so Rstest can run the slow Git-hook cases in parallel, while keeping the shared repository fixtures in one helper module.

On macOS, the same 13 focused cases improved from 4.07s to 1.80s (about 56% faster), and the Rstest-reported full pnpm test duration improved from 3.69s to 2.45s (about 34% faster). All 48 tests remain covered and pass together with the build, lint, type-check, and format checks.

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📥 Commits

Reviewing files that changed from the base of the PR and between f34fe2a and 34e46c1.

📒 Files selected for processing (5)

• packages/rstack/tests/setup/directories.test.ts
• packages/rstack/tests/setup/helpers.ts
• packages/rstack/tests/setup/install.test.ts
• packages/rstack/tests/setup/runtime-errors.test.ts
• packages/rstack/tests/setup/runtime.test.ts

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