compute_upcoming_passes requires the TLE store to be populated by
CelesTrak fetches. If a client requests passes before the async NOAA
group fetch completes, NOAA-15/18/19 are missing from predictions.
Seed the store with hardcoded fallback TLEs synchronously in
spawn_tle_refresh_task before spawning the async fetch. CelesTrak
data overwrites these entries once fetched. Also adds pass sanity
tests for NOAA-15 and NOAA-18.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
Signed-off-by: Stan Grams <sjg@haxx.space>
sjg
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