feat(patterns): add expanded animation pack with smoke tests

Add a broad set of new pattern modules and matching pattern smoke scripts so the new effects can be validated directly on-device.

src/patterns/comet_dual.py

@@ -0,0 +1,43 @@
+import utime
+
+
+class CometDual:
+    def __init__(self, driver):
+        self.driver = driver
+
+    def run(self, preset):
+        colors = preset.c if preset.c else [(255, 255, 255)]
+        tail = max(1, int(preset.n1) if int(preset.n1) > 0 else 6)
+        speed = max(1, int(preset.n2) if int(preset.n2) > 0 else 1)
+        gap = max(0, int(preset.n3))
+        p1 = 0
+        p2 = self.driver.num_leds - 1 - gap
+        last = utime.ticks_ms()
+        while True:
+            d = max(1, int(preset.d))
+            now = utime.ticks_ms()
+            if utime.ticks_diff(now, last) >= d:
+                for i in range(self.driver.num_leds):
+                    self.driver.n[i] = (0, 0, 0)
+                c1 = self.driver.apply_brightness(colors[0 % len(colors)], preset.b)
+                c2 = self.driver.apply_brightness(colors[1 % len(colors)] if len(colors) > 1 else colors[0], preset.b)
+                for t in range(tail):
+                    i1 = p1 - t
+                    if 0 <= i1 < self.driver.num_leds:
+                        s = (255 * (tail - t)) // max(1, tail)
+                        self.driver.n[i1] = ((c1[0]*s)//255, (c1[1]*s)//255, (c1[2]*s)//255)
+                    i2 = p2 + t
+                    if 0 <= i2 < self.driver.num_leds:
+                        s = (255 * (tail - t)) // max(1, tail)
+                        self.driver.n[i2] = ((c2[0]*s)//255, (c2[1]*s)//255, (c2[2]*s)//255)
+                self.driver.n.write()
+                p1 += speed
+                p2 -= speed
+                if p1 - tail > self.driver.num_leds and p2 + tail < 0:
+                    p1 = 0
+                    p2 = self.driver.num_leds - 1 - gap
+                last = utime.ticks_add(last, d)
+                if not preset.a:
+                    yield
+                    return
+            yield