Explore rig-based fine calibration with a known target

[gsrunion]

Proposal:

• Investigate a finer-grained calibration workflow using a known target on the actual OpenScan rig.

Potential approaches:

• fixed checkerboard with scanner-driven azimuth/elevation sweep
• known calibration object or fiducial target
• controlled angle/distance presets

Important constraint:

• optimize for pose diversity, not just mechanical precision

Why:

• should reduce operator variability
• should improve repeatability versus freehand checkerboard capture
• better matches real hardware usage

Desired outputs:

• candidate motion plan
• required metadata
• criteria for acceptable calibration quality