dangernoodle-io / breadboard / 25386766519

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feat: bb_button_events state machine (#209)

implements b1-177 phase b: semantic event layer on top of bb_button.

- state machine with idle, pressed_pending, wait_double, long_held states
- events: click, double_click, long_press_start, long_press_end, repeat
- delayed click: emits click only after double_click_window_ms expires (no
  second press seen); ~400ms latency by design — documented in header
- tick guard: mirrors bb_led_anim; no-op if called within tick_period_ms
- button cb path bypasses tick guard; raw edges always advance state
- platform/host: mock clock via bb_button_events_set_mock_time_ms
- platform/espidf: esp_timer auto-tick when auto_start_timer=true
- platform/arduino: extern "C" shim including host .c
- native_scaffold: registers bb_button_events component for pio test -e native
- 12 new host tests covering all events, edge cases, detach safety

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

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