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/breakout-garden/examples/haptic-trackball/haptic-trackball.py

@@ -0,0 +1,77 @@
+#!/usr/bin/env python3
+
+import time
+from trackball import TrackBall
+from drv2605 import DRV2605
+
+
+print("""This Pimoroni Breakout Garden example requires a
+DRV2605L Haptic Breakout and a Trackball Breakout.
+
+This example demonstrates how to generate haptic feedback
+as the trackball is scrolled/pressed.
+
+Press Ctrl+C to exit.
+""")
+
+
+# Set up Trackball Breakout.
+trackball = TrackBall(interrupt_pin=4)
+drv2605 = DRV2605()
+
+x = 0
+y = 0
+
+delta_x = 0
+delta_y = 0
+last_state = 0
+
+# Set up Haptic Breakout.
+drv2605.reset()
+drv2605.set_realtime_data_format('Unsigned')
+drv2605.set_feedback_mode('LRA')
+drv2605.set_mode('Real-time Playback')
+drv2605.go()
+
+try:
+    while True:
+        # Get positional values from trackball.
+        up, down, left, right, switch, state = trackball.read()
+        y += up
+        y -= down
+        x += right
+        x -= left
+
+        delta_x += right
+        delta_x -= left
+
+        delta_y += up
+        delta_y -= down
+
+        x = max(0, min(x, 255))
+        y = max(0, min(y, 255))
+
+        # Generate a longer click when trackball is pressed.
+        if state != last_state:
+            drv2605.set_realtime_input(255)
+            time.sleep(0.01)
+            drv2605.set_realtime_input(0)
+            last_state = state
+
+        # Generate shorter clicks when trackball is scrolled.
+        if abs(delta_x) > 2:
+            drv2605.set_realtime_input(255)
+            time.sleep(0.005)
+            drv2605.set_realtime_input(0)
+            delta_x = 0
+
+        elif abs(delta_y) > 2:
+            drv2605.set_realtime_input(255)
+            time.sleep(0.005)
+            drv2605.set_realtime_input(0)
+            delta_y = 0
+
+        time.sleep(0.001)
+
+except KeyboardInterrupt:
+    pass