Explore photogrammetry-oriented project export

[gsrunion]

Proposal:

• Add export options aimed at downstream photogrammetry workflows.

Candidate outputs:

• images plus adjacent pose sidecars
• calibration artifact alongside exported images
• export bundle structured for COLMAP-style workflows

Why:

• OpenScan3 is a strong acquisition frontend, but downstream reconstruction pipelines need structured exports
• Better exports reduce custom glue code outside OpenScan3

Related ideas:

• this can build on existing scan metadata rather than inventing new capture-side concepts

Reference code:

• openscan-pipeline/src/pipeline_orchestrator.py
• openscan-pipeline/src/colmap_reconstruct.py