Relocate bundled demo sources into bundled-demos/demo/

Mirror bundled-lib/ by keeping manifest.json at the bundle root and
shipping sample .py files from a demo/ subdirectory.

Co-authored-by: Cursor <cursoragent@cursor.com>

src/static/bundled-demos/demo/pattern_twinkle_demo.py

@@ -0,0 +1,54 @@
+"""Twinkle NeoPixel demo — self-contained (stdlib + simulated hardware only)."""
+
+import random
+import time
+
+from machine import Pin
+import neopixel
+
+# --- helpers
+
+
+def _clamp(channel: int) -> int:
+    return max(0, min(255, int(channel)))
+
+
+def twinkle_frame(
+    led_count: int,
+    frame: int,
+    base=(0, 0, 8),
+    sparkle=(255, 255, 180),
+    sparkles: int = 3,
+    seed: int = 1337,
+):
+    if led_count <= 0:
+        return []
+    out = [tuple(_clamp(v) for v in base) for _ in range(led_count)]
+    rng = random.Random(seed + frame)
+    for _ in range(min(max(0, sparkles), led_count)):
+        idx = rng.randrange(led_count)
+        out[idx] = tuple(_clamp(v) for v in sparkle)
+    return out
+
+
+# --- demo
+
+NUM_LEDS = 16
+
+np = neopixel.NeoPixel(Pin(4), NUM_LEDS)
+
+for frame in range(120):
+    frame_colors = twinkle_frame(
+        len(np),
+        frame,
+        base=(0, 0, 6),
+        sparkle=(255, 210, 130),
+        sparkles=3,
+    )
+    for i, color in enumerate(frame_colors):
+        np[i] = color
+    np.write()
+    time.sleep(0.08)
+
+np.fill((0, 0, 0))
+np.write()