test: stabilize non-interactive env hook

[vsumner]

Summary

• force non-interactive env in tests to stabilize hook behavior
• prevent CI env detection from skipping git command prefix checks

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Summary by cubic

Stabilizes non-interactive-env hook tests by forcing a non-interactive Unix-like environment. Sets OPENCODE_NON_INTERACTIVE=true and normalizes SHELL/PSModulePath so CI detection doesn't skip git command prefix checks.

^{Written for commit 4e8106b. Summary will update on new commits.}

[cubic-dev-ai]

No issues found across 1 file

Confidence score: 5/5

• Automated review surfaced no issues in the provided summaries.
• No files require special attention.

[kdcokenny]

appreciate the pr 🚀