feat(03-02): implement animation library — 7 types with registry and factory

- AnimationBase ABC with render(t, led_count) and from_params() contract
- SolidColorAnimation: time-independent uniform fill
- ChaseAnimation: moving lit segment with forward/reverse support
- PulseAnimation: sine-wave breathing effect (speed maps to period)
- RainbowAnimation: HSV hue cycle across strip via colorsys.hsv_to_rgb
- StrobeAnimation: on/off flashing at 1-20 Hz with configurable duty cycle
- ColorWipeAnimation: progressive fill from start or end
- FireAnimation: Fire2012 algorithm with cooling/sparking/heat-to-color mapping
- ANIMATION_REGISTRY + create_animation() factory function
- All 24 tests passing

lightsync/animations/__init__.py

@@ -0,0 +1,48 @@
+"""Animation library — 7 built-in animation types with a factory registry."""
+from lightsync.animations.base import AnimationBase
+from lightsync.animations.solid_color import SolidColorAnimation
+from lightsync.animations.chase import ChaseAnimation
+from lightsync.animations.pulse import PulseAnimation
+from lightsync.animations.rainbow import RainbowAnimation
+from lightsync.animations.strobe import StrobeAnimation
+from lightsync.animations.color_wipe import ColorWipeAnimation
+from lightsync.animations.fire import FireAnimation
+
+__all__ = [
+    "AnimationBase",
+    "SolidColorAnimation",
+    "ChaseAnimation",
+    "PulseAnimation",
+    "RainbowAnimation",
+    "StrobeAnimation",
+    "ColorWipeAnimation",
+    "FireAnimation",
+    "ANIMATION_REGISTRY",
+    "create_animation",
+]
+
+ANIMATION_REGISTRY: dict[str, type[AnimationBase]] = {
+    "solid_color": SolidColorAnimation,
+    "chase": ChaseAnimation,
+    "pulse": PulseAnimation,
+    "rainbow": RainbowAnimation,
+    "strobe": StrobeAnimation,
+    "color_wipe": ColorWipeAnimation,
+    "fire": FireAnimation,
+}
+
+
+def create_animation(name: str, params: dict) -> AnimationBase:
+    """Create an animation by registry name.
+
+    Args:
+        name: Animation type name (e.g. "chase", "fire").
+        params: CueModel.params dict passed to from_params().
+
+    Raises:
+        ValueError: If name is not in ANIMATION_REGISTRY.
+    """
+    cls = ANIMATION_REGISTRY.get(name)
+    if cls is None:
+        raise ValueError(f"Unknown animation: {name!r}. Available: {sorted(ANIMATION_REGISTRY)}")
+    return cls.from_params(params)