Assign return value to rotation_profile variable for documentation consistency

[Copilot]

The measured_rotation function returned vv / tt directly, but documentation specified the return value as rotation_profile, creating a mismatch between implementation and API contract.

Changes

• Assign vv / tt to rotation_profile variable before returning
• Maintains identical behavior while aligning code with documented interface

# Before
return rbins, vv / tt

# After  
rotation_profile = vv / tt
return rbins, rotation_profile

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