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_rainbow_demo.py

@@ -0,0 +1,47 @@
+"""Rainbow NeoPixel sweep — self-contained (stdlib + simulated hardware only)."""
+
+import time
+
+from machine import Pin
+import neopixel
+
+# --- helpers (same logic as bundled led_patterns.py, inlined here)
+
+
+def _clamp(channel: int) -> int:
+    return max(0, min(255, int(channel)))
+
+
+def wheel(pos: int):
+    """Return rainbow RGB at position 0–255."""
+    pos = 255 - (pos & 255)
+    if pos < 85:
+        return (_clamp(255 - pos * 3), 0, _clamp(pos * 3))
+    if pos < 170:
+        pos -= 85
+        return (0, _clamp(pos * 3), _clamp(255 - pos * 3))
+    pos -= 170
+    return (_clamp(pos * 3), _clamp(255 - pos * 3), 0)
+
+
+def rainbow_frame(led_count: int, frame: int, step: int = 4):
+    if led_count <= 0:
+        return []
+    return [wheel((i * 256 // led_count + frame * step) & 255) for i in range(led_count)]
+
+
+# --- demo
+
+NUM_LEDS = 16
+
+np = neopixel.NeoPixel(Pin(4), NUM_LEDS)
+
+for frame in range(120):
+    frame_colors = rainbow_frame(len(np), frame, step=5)
+    for i, color in enumerate(frame_colors):
+        np[i] = color
+    np.write()
+    time.sleep(0.05)
+
+np.fill((0, 0, 0))
+np.write()