feat(simulator): add GUI runner, stubs, and workspace assets

Add host simulator scaffolding, examples, and docs so led-driver main can run end-to-end with MicroPython module stubs.

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

examples/blink.py

@@ -0,0 +1,19 @@
+"""Example pattern for led-simulator / led-driver (generator + yield per tick)."""
+
+import utime
+
+
+class Blink:
+    def __init__(self, presets):
+        self.presets = presets
+
+    def run(self, preset):
+        colors = preset.c if preset.c else [(255, 255, 255)]
+        idx = 0
+        delay_ms = max(1, int(preset.d))
+        while True:
+            rgb = colors[idx % len(colors)]
+            self.presets.fill(self.presets.apply_brightness(rgb, preset.b))
+            yield
+            utime.sleep_ms(delay_ms)
+            idx += 1