Proposed config file changes for "project spec v1"

[ksikka]

The context is aligning app / CLI directory structure.

To summarize the major changes:

• No more paths to label files (csv_path) or video directory (videos_dir).
• Ability to reference a TXT file of unsupervised training sessions.
• Ability to reference CSV files that override default Session -> calibration and bbox mapping.
• All paths are relative to data_dir.
• data_dir remains an absolute path, but I plan to make it overrideable at runtime.

Field Mapping

• videos_dir $\rightarrow$ unsup_sessions_list
  • Note: Videos are now always looked up from data_dir/videos
  • If an alternative storage location is required, users can use a symlink.
• csv_file $\rightarrow$ label_file_key
• bbox_file $\rightarrow$ use_bboxes AND session_bbox_file
• camera_params_file $\rightarrow$ session_calibration_file

The new fields are described in their config file comments

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This design is more flexible than my original proposal; it allows overriding default locations of calibration files and bboxes.

Added these doc sections which describe this PR's proposal.

calibrations: https://docs.google.com/document/d/1H9OCIRxlA5JggStAVtLR9RoW358I9ESojLeaepKqcsA/edit?disco=AAABuJdUFkM
bboxes: https://docs.google.com/document/d/1H9OCIRxlA5JggStAVtLR9RoW358I9ESojLeaepKqcsA/edit?disco=AAABuJdUFkg

[ksikka]

closing as cleanup. the ideas within can be documented in idea docs and reimplemented with claude code.