Add missing test file for rotate_session_key.py

[coderabbitai]

Context

The script scripts/rotate_session_key.py exists in the repository, but its corresponding test file scripts/tests/test_rotate_session_key.py is missing.

According to the scripting standards documented in docs/scripting-standards.md, every script requires automated coverage via pytest, and tests should reside in scripts/tests/ mirroring the script names.

Expected outcome

Create scripts/tests/test_rotate_session_key.py with appropriate test coverage for scripts/rotate_session_key.py.

References

• PR: Remove ephemeral previews #297
• Comment: Remove ephemeral previews #297 (comment)
• Requested by: @leynos

[traycerai]

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