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/seismograph/README.md

@@ -0,0 +1,49 @@
+# Seismograph example
+
+The Dino-Detect v1.2 beta is a dino stomp detector. It's a
+UNIX system, I know this.
+
+## Pre-requisites
+
+This example requires:
+
+- A Pimoroni [Breakout Garden](https://shop.pimoroni.com/products/breakout-garden-hat-i2c-spi)
+- A Pimoroni [LSM303D 6DoF Sensor Breakout](https://shop.pimoroni.com/products/lsm303d-6dof-motion-sensor-breakout)
+- A Pimoroni [1.12" OLED Breakout (SPI)](https://shop.pimoroni.com/products/1-12-oled-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 the libraries to run the I2C breakouts.
+
+For this example you'll need to make sure some additional software is installed:
+
+```
+sudo apt install python3-pil
+```
+
+You'll need to clone and install the library for the 1.12" OLED Breakout (SPI)
+as follows:
+
+```
+git clone https://github.com/pimoroni/sh1106-python
+sudo ./install.sh
+```
+
+This example assumes that you have the OLED plugged into the front slot on the
+Breakout Garden HAT, which should also work with the Breakout Garden Mini HAT.
+To change it to the back slot, change `device=1` to `device=0` on the line 
+where the OLED is set up. 
+
+## Running this example
+
+To run this example, type `./seismograph.py` in the terminal.
+
+Note that it takes a baseline reading initially to zero out the axes,
+and then calculates subsequent readings against the baseline, so make
+sure that your Breakout Garden is sitting still when you start the
+program.
+
+The `sensitivity` variable can be changed to make the seismograph more or
+less sensitive to dino stomps.