ENH - GLOWS L2 Apply sunrise/sunset offsets to is_night flag transitions

[maxinelasp]

Description

The infrastructure to read sunrise_offset and sunset_offset from pipeline settings already exists in PipelineSettings dataclass, but these offsets are not being applied anywhere in the processing code. Need to implement the logic to shift is_night flag transitions according to these offsets during L2 processing.

Background

Per Marek (algorithm doc v4.4.7 Sec. 3.9.1, item 2):

• When is_night transitions from 0->1 (sunset): shift by sunset_offset histograms
• When is_night transitions from 1->0 (sunrise): shift by sunrise_offset histograms
• Offsets can be negative, zero, or positive values

Required Changes

1. Identify where is_night flag transitions occur in L1B histogram sequences
2. Apply sunset_offset when detecting is_night 0->1 transition
3. Apply sunrise_offset when detecting is_night 1->0 transition
4. Ensure offsets are applied during L2 processing when computing from L1B histograms

Note: offsets are already read from pipeline settings and available for use.

Reference

• Algorithm doc v4.4.7, Sec. 3.9.1, item 2
• Pipeline settings file: imap_glows_lxx-pipeline-settings_20250923_v000.json

Related

Closes #1991