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J. Nick Koston
1017ce87d6
The debug component's reset reason text sensor was returning an empty string on RP2040/RP2350 platforms. Read the chip reset registers to report the actual reset source. RP2040: reads VREG_AND_CHIP_RESET for POR and RUN pin. RP2350: reads POWMAN chip_reset for POR, brown-out, RUN pin, and power supply glitch. Both: checks watchdog_caused_reboot() from the Pico SDK, and distinguishes between crash (HardFault), watchdog timeout, and software reset by consulting the crash handler data. Also adds buf_append_str() helper to helpers.h for efficient plain string appends without format parsing overhead.
