Add nightly observation reports

[Copilot]

Implements automated end-of-night reports summarizing observations taken and reasons for non-observation (weather, darkness, power, disk space).

Implementation

• Report generator (src/panoptes/pocs/utils/report.py): NightlyReport class queries database for observed list and safety checks, formats human-readable summary
• Housekeeping state integration: Generates report before resetting observed list, saves to configurable directories.reports path (default: ~/reports)
• Safety analysis: Extracts failure reasons from database safety records (weather unsafe, not dark, power loss, insufficient disk space)

Report Format

OBSERVATIONS SUMMARY
  Total observation sequences: 2
  Unique fields observed: 2
  
  Observations by field:
    - M42OrionNebula: 1 sequence(s)
      * Started: 2026-02-13T01:30:00, Exposures: 15/30

SAFETY SUMMARY
  AC Power Connected...................... ✓ PASS
  Weather Safe............................ ✗ FAIL
  
  Reasons for non-observation:
    - Unsafe weather conditions

Reports saved as nightly_report_YYYYMMDD.txt. Error handling ensures housekeeping continues if report generation fails.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Create a nightly report</issue_title>
<issue_description>Create a nightly report that describes what observations were taken and, more importantly, why observations were not conducted (bad weahter? errors?)</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Create a nightly report #1353

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[codecov]

Codecov Report

❌ Patch coverage is 94.38596% with 16 lines in your changes missing coverage. Please review.
✅ Project coverage is 65.75%. Comparing base (b1d44e7) to head (8fa3c00).

Files with missing lines	Patch %	Lines
src/panoptes/pocs/utils/report.py	87.50%	6 Missing and 6 partials ⚠️
tests/test_housekeeping_state.py	94.73%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1387      +/-   ##
===========================================
+ Coverage    64.83%   65.75%   +0.91%     
===========================================
  Files          104      107       +3     
  Lines         9444     9729     +285     
  Branches       831      850      +19     
===========================================
+ Hits          6123     6397     +274     
- Misses        3178     3181       +3     
- Partials       143      151       +8     

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