dangernoodle-io / breadboard / 24739927105

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feat: add bb_json portable JSON builder and minimal parser (#47)

- public header components/bb_json/include/bb_json.h — opaque bb_json_t, no
  cJSON/ArduinoJson leak; builders, obj/arr setters, arr append, serialize,
  free, parse, and named getters for string/number/bool
- cJSON backend platform/espidf/bb_json/bb_json_cjson.c shared by ESP-IDF and
  host via symlink at platform/host/bb_json/bb_json_cjson.c
- ArduinoJson backend platform/arduino/bb_json/bb_json_arduinojson.cpp; default
  document size 512 bytes, overridable via -DBB_JSON_ARDUINO_DOC_BYTES=N;
  cross-document child adoption via serialize-then-deserialize merge
- 22 host round-trip tests in test/test_host/test_bb_json.c covering all value
  types, nested obj-in-obj, arr-in-obj, array of strings/numbers/objects,
  numeric edge cases (zero, negative, large, decimal), missing-key false
  returns, invalid parse, length-bounded parse, and type mismatch
- wire tests into native pio env (platformio.ini) and test_main.c
- add ArduinoJson@^6.21.5 to arduino-uno-cc3000 example; both smoke targets
  (elecrow-p4-hmi7, arduino-uno-cc3000) build clean
- update README component table and test count

Co-authored-by: Claude Sonnet 4.6 <noreply@anthropic.com>

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