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/nightlight/README.md

@@ -0,0 +1,34 @@
+# Nightlight example
+
+A simple little example of how to make a nightlight with the LTR-559 and 5x5 
+RGB matrix breakouts. It can be toggled on or off by tapping the sensor, or 
+triggered automatically when it gets dark.
+
+## Pre-requisites
+
+This example requires:
+
+- A Pimoroni [Breakout Garden](https://shop.pimoroni.com/products/breakout-garden-hat-i2c-spi)
+- A Pimoroni [LTR-559 Light & Proximity Sensor Breakout](https://shop.pimoroni.com/products/ltr-559-light-proximity-sensor-breakout)
+- A Pimoroni [5x5 RGB Matrix Breakout](https://shop.pimoroni.com/products/5x5-rgb-matrix-breakout)
+
+## Installation
+
+Pop the breakouts into your Breakout Garden, and then run the `install.sh`
+script in the root of this repository with `sudo ./install.sh` to automagically
+install all of the required libraries.
+
+## Running this example
+
+To run this example, type `./nightlight.py` in the terminal.
+
+You can change the RGB values of the `colour` variable to change the colour 
+of the light to whatever you wish. If you want the light and proximity 
+thresholds to be more or less sensitive, then you can change the values of 
+the `light_threshold` and `prox_threshold` variables.
+
+## Notes
+
+It's probably best to have the sensor and matrix breakouts on either side 
+of your Breakout Garden HAT, so that they're spaced apart and the LTR-559 
+won't be affected by the light from the matrix.