Add JSON serial interface and screen-free analyzers - #1346
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Adds a small machine-readable (JSON) command set on top of the existing USB serial CLI so any host program can parse device data reliably instead of scraping human-formatted text, plus a way to run the graphical analyzers with no screen attached. - New commands: jsoninfo (handshake/caps), jsonstatus (poll-friendly state), jsonlist <a|s|c|i|p|t> (NDJSON list rows + a closing end line), jsonmode (toggle streaming). Every machine line is prefixed with "@j " and is one self-contained JSON object with a "t" type tag. - New analyzer [-t wifi|bt|chan] CLI command starts the Channel/BT/Channel Activity analyzers without any screen interaction. Sample computation and emit now run independent of HAS_SCREEN; only the on-device chart drawing and touch buttons stay screen-gated. - Additive and board-neutral: existing CLI behaviour is unchanged, and continuous streaming is opt-in (gated behind JSON mode) so a plain serial monitor is never flooded with "@j" lines. See JSON_SERIAL_INTERFACE.md for the full protocol and usage.
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Adds a small machine-readable (JSON) command set on top of the existing USB serial CLI so any host program can parse device data reliably instead of scraping human-formatted text, plus a way to run the graphical analyzers with no screen attached.
See JSON_SERIAL_INTERFACE.md for the full protocol and usage.