Update to Dark Script

[edenacadia]

Update to collect_camera_configs_for_darks and shot_in_the_dark python scripts for end-of-night dark taking.

Summary

Initial work done to make script compatible with new datetime file formats.
This work written in part by Codex 5.3 in response to the prompt: "In the shot_in_the_dark script, we need a way to cleanly exit on a keyboard interrupt. When interrupted, the script should print out a "exiting" statement, release control of the cameras and shutters, and save a json file with the darks remaining to do".

• Extend collect_camera_configs_for_darks to support richer date/time filtering (--night, --date-start/--date-end, and --last-night) and include observation directory metadata in output for better provenance.
• Improve dark-config collection robustness by expanding ignored header keys, adding timestamp parsing helpers, and tightening validation/logging for partial or dark-only samples.
• Add graceful interrupt handling in shot_in_the_dark: print exiting, stop worker threads cooperatively, persist remaining dark configurations to *_remaining.json, and always run cleanup to return observing/streamwriter/camera state to safe defaults (including EM gain reset).

Test plan

• python -m py_compile scripts/shot_in_the_dark
• Run collect_camera_configs_for_darks with:
  • --night YYYY-MM-DD
  • --date-start YYYY-MM-DD_HHMMSS --date-end YYYY-MM-DD_HHMMSS
  • --last-night
• Run shot_in_the_dark against a small config and press Ctrl+C mid-run; verify:
  • exiting is printed
  • cleanup logs confirm observing + streamwriter shutdown and EM gain reset
  • <input>_remaining.json is written with unfinished configs
• Confirm normal (non-interrupted) run behavior is unchanged.

[joseph-long]

Looking good! There are some print()s that could be logs, etc, but I think it's good to begin testing.

[edenacadia]

@joseph-long Cleaned up print statements and finished testing