dangernoodle-io / breadboard / 25356383073

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feat: bb_button + bb_button_gpio (parent + GPIO driver, ISR where available) (#206)

- bb_button parent: public API (set_callback, poll, is_pressed, get_queue, close),
  debounce algorithm (timestamp-based, 25 ms default), optional FreeRTOS queue
  on ESP-IDF (NULL on host/arduino)
- bb_button_driver.h: vtable (is_pressed, poll, close) + bb_button_handle_create
  and bb_button_dispatch_raw semi-private API
- bb_button_gpio driver: 3 platform implementations
  - ESP-IDF: gpio_install_isr_service + ISR → intr_q → service task (tskIDLE+5)
  - Arduino: attachInterrupt(CHANGE) with 4-slot thunk table; polling fallback
    when pin has no interrupt support or prefer_isr=false; NOT_AN_INTERRUPT
    fallback define for Renesas R4 which uses IS_PIN_INTERRUPT instead
  - Host: in-memory state; bb_button_host_inject_edge() for test injection
- 15 host tests: debounce, cb dispatch, active-low, close-safety, gpio driver
- scripts/native_scaffold.py: bb_button + bb_button_gpio COMPONENT_MAP entries
- platformio.ini: add bb_button + bb_button_gpio; -DBB_BUTTON_MOCK_CLOCK for native

Build verified: host (483/483), esp32c3 (ESP-IDF), r4_wifis3 (Arduino Cortex-M),
uno_cc3000 (AVR) — temporarily added to smoke REQUIRES, confirmed compile, reverted.
No smoke wiring artifacts in diff.

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

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