docs: use supported test wrapper in agent guide

[zackees]

Summary

• replace the nonexistent uv run test invocation in the root agent guide with the supported bash test wrapper
• keep the documented focused-crate syntax aligned with docs/DEVELOPMENT.md

Fixes #1078.

Verification

bash test -p fbuild-deploy -- volume_disappearance_timeout_is_actionable_without_diagnosing_qspi
1 passed; 0 failed

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📥 Commits

Reviewing files that changed from the base of the PR and between b82948e and 7dacc4f.

📒 Files selected for processing (1)

• CLAUDE.md

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch docs/fix-test-command

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