fix(auth): tighten Windows credentials ACL

[naufalfx805-source]

Summary

Tightens Windows credential file ACL permissions and documents the credential permission hardening.

Changes

• Tightened Windows credentials ACL
• Added documentation for credential permission tightening

Testing

• Tests pass locally

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📥 Commits

Reviewing files that changed from the base of the PR and between 40d18d2 and b906cf2.

📒 Files selected for processing (2)

• src/lib/credentials.test.ts
• src/lib/credentials.ts

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[github-actions]

Thanks for the PR, @naufalfx805-source! A quick note on our workflow: for features and behavior changes we require contributors to open an issue first, claim it by commenting /assign on the issue, then submit a PR that links it (e.g. Closes #123). This PR isn't linked to any issue yet, so it is not review-ready. After fixing it, edit the PR description or push a commit to re-run this check. See CONTRIBUTING → Contribution model.

[naufalfx805-source]

Ready for review! 🚀 Submitting for the CLI bounty program.

[naufalfx805-source]

Closing as a duplicate — this change already landed in main via 94f78ad (#253). This branch was cut from an older base, which is why it showed as conflicting. Apologies for the noise.