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/install-legacy.sh

@@ -0,0 +1,57 @@
+#!/bin/bash
+
+printf "Breakout Garden: Auto Installer\n\n"
+
+if [ $(id -u) -ne 0 ]; then
+	printf "Script must be run as root. Try 'sudo ./install.sh'\n"
+	exit 1
+fi
+
+printf "Please plug the breakouts you would like to install into your Breakout Garden\n\n"
+read -p "Press enter to continue..."
+printf "\n"
+
+WORKING_DIR=`pwd`
+TMP_DIR="/tmp/breakout-garden"
+
+results=`python autodetect.py`
+found=`echo "$results" | wc -l`
+
+if [[ "$found" -eq "0" ]] || [[ "$results" == "" ]]; then
+	printf "Sorry, I couldn't find any breakouts!\n"
+	exit 1
+fi
+
+printf "Found $found breadkout(s):\n"
+
+echo "$results" | while read line; do
+	printf "$line\n"
+done
+
+printf "\n"
+
+read -p "Press enter to continue..."
+
+if [[ ! -d "$TMP_DIR" ]]; then
+	mkdir "$TMP_DIR"
+fi
+
+python autodetect.py --install | while read line; do
+	printf "Installing $line\n"
+	git_dir="$line"
+	cd $TMP_DIR
+	if [[ ! -d "$git_dir/.git" ]]; then
+		rm -f $git_dir
+		git clone https://github.com/pimoroni/$line $git_dir
+	fi
+	cd $git_dir
+	git pull origin master
+	if [[ -f "install.sh" ]]; then
+		./install.sh
+	else
+		printf "Warning: No install.sh found for $line. Skipping!";
+	fi
+	cd $WORKING_DIR
+done
+
+printf "\nBreakout Garden setup complete! Enjoy your breakouts.\n"