James Smith f549957c0b
perf(satellite): compute ground tracks in thread pool, not inline ...
Ground track computation (90 Skyfield points per satellite) was blocking
the 1Hz tracker loop on every cache miss. On cold start with multiple
tracked satellites this could stall the SSE stream for several seconds.
Tracks are now computed in a 2-worker ThreadPoolExecutor. The tracker
loop emits position without groundTrack on cache miss; clients retain
the previous track via SSE merge until the new one is ready.
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