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/uninstall.sh

@@ -0,0 +1,25 @@
+#!/bin/bash
+
+LIBRARY_VERSION=`cat library/setup.cfg | grep version | awk -F" = " '{print $2}'`
+LIBRARY_NAME=`cat library/setup.cfg | grep name | awk -F" = " '{print $2}'`
+
+printf "$LIBRARY_NAME $LIBRARY_VERSION Python Library: Uninstaller\n\n"
+
+if [ $(id -u) -ne 0 ]; then
+	printf "Script must be run as root. Try 'sudo ./uninstall.sh'\n"
+	exit 1
+fi
+
+cd library
+
+printf "Unnstalling for Python 2..\n"
+pip uninstall $LIBRARY_NAME
+
+if [ -f "/usr/bin/pip3" ]; then
+	printf "Uninstalling for Python 3..\n"
+	pip3 uninstall $LIBRARY_NAME
+fi
+
+cd ..
+
+printf "Done!\n"