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/README.md

@@ -0,0 +1,29 @@
+# Breakout Garden
+
+Software and examples for the Pimoroni [Breakout Garden](https://shop.pimoroni.com/products/breakout-garden-hat-i2c-spi), 
+a simple way to build projects using [breakouts](https://shop.pimoroni.com/collections/pimoroni-breakouts), with 
+absolutely no soldering required.
+
+## Installing
+
+Breakout Garden doesn't require any software of its own, but each breakout you use will need a Python library.
+
+We've created a handy script to get you started:
+
+1. Plug in all of your Breakout Garden-compatible breakouts
+2. Run `wget https://github.com/pimoroni/breakout-garden/archive/master.zip` to download software. 
+3. Run `unzip master.zip` to unzip the software. 
+4. Run `cd breakout-garden-master` to enter code folder. 
+5. Run `sudo ./install.sh`
+6. Step through the install process
+7. Enjoy!
+
+## Examples
+
+We've put together a few fun [examples](examples/) to show what's possible with Breakout Garden. Each example 
+has its own README telling you about it, which breakouts are required, and about how to use it.
+
+## Bugs, Issues and Problems
+
+If you have trouble with your Breakout Garden try our support forums: https://forums.pimoroni.com/
+