fix(setup): validate Git hooks directory

[chenjiahan]

Invalid --hooks-dir values can produce unintended or mismatched Git hook targets. This PR normalizes hook directory separators and rejects empty or absolute paths before touching Git or the filesystem. It also covers the CLI exit status and diagnostics for both cases.

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• packages/rstack/src/setup/install.ts
• packages/rstack/tests/cli/setup/index.test.ts

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[chatgpt-codex-connector]

Reject drive-qualified Windows hook paths

On Windows, a drive-relative input such as --hooks-dir C:hooks is not considered absolute by path.isAbsolute, so it passes this validation even though it is not relative to cwd. The later path.join(cwd, resolvedDir, '_') produces a path containing C: as an interior component, causing setup to fail with a filesystem write-failed error instead of the intended invalid-directory diagnostic; reject paths with a drive root as well.

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