Dropping OpenSky to Receive It Myself — Feeding RTL-SDR ADS-B into My Terminal Globe ttymap

The aircraft plugin in ttymap, the terminal globe I built earlier, pulled overhead planes from OpenSky's public API. This time I replace that with real radio I receive on my own antenna. A reception journey: plug in an RTL-SDR, get past the DVB driver trap, catch raw frames with rtl_adsb, turn them into lat/lon with CPR decoding, and bridge a local JSON server so a ttymap user plugin can show them.