Clear stale version metadata when binary verification fails

[ametel01]

Summary

• refreshVerifiedTools now clears Version alongside BinaryPath when a previously known binary is no longer found on PATH.

Test plan

• TestRefreshVerifiedToolsClearsVersionForMissingBinary — verifies both BinaryPath and Version are cleared
• make verify passes

Closes #8

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 3edfa803-6ed8-4c21-8093-a7eed57bb9e7

📥 Commits

Reviewing files that changed from the base of the PR and between 55eb7aa and ba10a6c.

📒 Files selected for processing (3)

• CHANGELOG.md
• cmd/atb/runtime.go
• cmd/atb/runtime_test.go

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch fix/8-clear-stale-version-on-missing-binary

📝 Coding Plan

• Generate coding plan for human review comments

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