Remove dead stdinInteractiveOK and go-isatty direct dependency

[bschellenberger2600]

Summary

Removed the unused stdinInteractiveOK helper and its tests, and dropped the direct github.com/mattn/go-isatty module require after go mod tidy.

Why this change?

stdinInteractiveOK was only referenced from cmd/root_test.go and was never called from runRainDefaultStream or any other production path. That left dead code and an unnecessary direct dependency on go-isatty.

Bug Reproducibility (if this fixes a bug)

Not a runtime bug. A repository-wide search showed no production call sites for stdinInteractiveOK.

Tests

• I added or updated tests for all code changes in this PR. (removed tests that only covered deleted code)
• For bug fixes, I added regression coverage.
• I ran go test -race -count=1 ./....
• I ran go vet ./....

Risk / Rollback Notes (optional)

Low risk: no production code path invoked the removed function. Roll back by reverting this commit if needed.

  

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: fc0c49da-69d5-4a2e-90fe-1c3dab41ac54

📥 Commits

Reviewing files that changed from the base of the PR and between 265e6e7 and aed1e72.

⛔ Files ignored due to path filters (1)

• go.sum is excluded by !**/*.sum

📒 Files selected for processing (3)

• cmd/root.go
• cmd/root_test.go
• go.mod

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch cursor/fix-dead-stdin-interactive-955b

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[bschellenberger2600]

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bugbot review

[cursor]

✅ Bugbot reviewed your changes and found no new issues!

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^{Reviewed by Cursor Bugbot for commit aed1e72. Configure here.}