Initial backup of LTP-305G matrix clock setup on matrixpi

Captures everything needed to redeploy the two-display clock (hour on I2C
0x61, minute on I2C 0x63) on a fresh Pi:

- Both systemd units (matrix0x61.service, matrix0x63.service)
- Deployed Pimoroni script tree, including the local %I (12-hour) clock
  customization
- Vendored upstream sources (ltp305-python, breakout-garden) so restore is
  fully offline-capable
- Boot config snippet enabling I2C
- install.sh that wires it all back up idempotently
- Inventory doc cross-referencing every live-system path

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

vendor/ltp305-python/examples/eyes.py

@@ -0,0 +1,49 @@
+import math
+import time
+import random
+
+
+print("""eyes.py - They're watching you!
+
+Press Ctrl+C to exit!
+
+""")
+
+
+from ltp305 import LTP305
+
+display = LTP305()
+
+
+def eye(x, y):
+    display.set_pixel(x, y, True)
+    display.set_pixel(x, y + 1, True)
+    display.set_pixel(x + 1, y, True)
+    display.set_pixel(x + 1, y + 1, True)
+
+
+while True:
+    t = time.time() * math.pi
+
+    # Get eye x and y positions in the range 0.0 to 1.0
+    # You can plug in your own 0.0 to 1.0 values here
+    x = (math.sin(t / 2) + 1) / 2
+    y = (math.sin(t / 4) + 1) / 2
+
+    # Multiply them up to display coords and convert to itn
+    x = math.floor(x * 4)
+    y = math.floor(y * 6)
+
+    # Clear the display
+    display.clear()
+
+    # Blink occasionally
+    if not random.randint(0, 20) == 2:
+        # Draw the eyes if not blinking
+        eye(x, y)
+        eye(x + 5, y)
+
+    # Update the display at 10FPS
+    # This gives our crude blink code time to not look like a random flicker
+    display.show()
+    time.sleep(1.0 / 10)