dangernoodle-io / breadboard / 27165163702

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feat(bb_led_rgb_pwm): 3-GPIO common-anode RGB PWM LED driver (#371)

New bb_led backend driving R/G/B on three LEDC channels (LEDC_TIMER_0
LOW_SPEED), reporting BB_LED_CAP_RGB|BRIGHTNESS|ONOFF so bb_led_set_color
renders real colors. Mirrors bb_led_apa102's color x level model: set_color
stores the base hue, set_level gamma-corrects (bb_led_gamma_cie) and scales it
across all 3 channels so bb_led_anim's BREATHE modulates a colored LED.
active_low inversion for common-anode wiring.

- cfg {gpio_r,gpio_g,gpio_b, freq_hz, resolution_bits, active_low}
- own TU-static LEDC channel allocator (3 sequential channels); collision with
  bb_led_pwm documented (independent counters — safe when only one is used)
- host mock + 13 host tests (duty / active_low / gamma / hue-preservation)
- wired into platformio.ini, scripts/native_scaffold.py, test/test_host/test_main.c

Implements B1-250. Consumer: TaipanMiner CYD (R=22/G=16/B=17).

Co-authored-by: Claude Opus 4.8 <noreply@anthropic.com>

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