Four-part implementation:
- Part 1: TLE cache handler subscribes central.sat.tle.>, upserts latest-wins
on epoch, 14-day staleness exclusion at read time (tle_handler.py)
- Part 2: SGP4 pass predictor with 30s step propagation, ECI→topocentric
look angles, grouped into PassInfo objects (pass_predictor.py)
- Part 3: ZCTA centroid CSV vendored (33,144 ZIPs), lazy-loaded for
ZIP→lat/lon lookup with no runtime network dependency
- Part 4: !satpass command with three forms: bare (adapter_config defaults),
name/NORAD ID, ZIP code observer. Location chain: GPS→ZIP→ask.
Reply formatted as 'ISS 09:36-09:43 MDT max 64deg SW->NE'
Schema v16→v17 (sat_tles table). sgp4>=2.22 added to requirements.
24 new tests covering TLE upsert/staleness, pass prediction reference,
ZCTA lookup, command routing, location chain, and reply format.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
