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feat(bb_led_pwm): brightness-controlled LED via PWM (Phase B) (#199)

* feat(bb_led_pwm): brightness-controlled LED via PWM (B1-171)

Implements single-LED PWM driver with on/off + brightness support.
Caps: BB_LED_CAP_ONOFF | BB_LED_CAP_BRIGHTNESS; count = 1.

Behavior: set_on(true) → 100% duty; set_on(false) → 0% duty;
set_brightness(pct) → linearly map [0..100] to duty range. Active_low
inverts: pct 0 → max duty, pct 100 → min duty. Initial state off.

Platform-specific:
- ESP-IDF: LEDC driver, single shared LEDC_TIMER_0 in LOW_SPEED_MODE,
  up to 8 channels (allocation warning if reconfig attempt).
- Arduino: analogWrite(pin, 0..255); resolution_bits ignored.
- Host: mock captures last pct per pin for testing.

Test coverage: 10 tests (open/close, brightness, on/off, active_low,
color unsupported, idx validation, arg validation, initial state).
All 447 host tests pass.

Smoke builds pass: esp32, uno_cc3000.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

* feat(smoke): exercise bb_led_pwm across smoke envs

Wire bb_led_pwm into smoke app and build configs. Opens instance on
GPIO 4, freq 5kHz, 8-bit resolution, active_low=false. Sets brightness
to 25% then closes, exercising both esp32 (LEDC) and Arduino (analogWrite)
backends.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

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Co-authored-by: Claude Opus 4.7 <noreply@anthropic.com>

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