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J. Nick Koston
662f14e10b
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, RUN pin, and debug port. RP2350: reads POWMAN chip_reset for POR, brown-out, RUN pin, watchdog variants, glitch detect, debugger, rescue, and core powerdown. Both: checks watchdog_caused_reboot() from the Pico SDK. Also adds buf_append_str() helper to helpers.h for efficient plain string appends without format parsing overhead.
