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/breakouts.config

@@ -0,0 +1,31 @@
+0x0a: trackball-python: trackball: rgb illuminated mini trackball
+0x0b: trackball-python: trackball: rgb illuminated mini trackball
+0x3c: sh1106-python: luma.oled: 1.12" mono OLED
+0x3d: sh1106-python: luma.oled: 1.12" mono OLED
+0x1d: lsm303d-python: lsm303d: lsm303d 6dof motion sensor
+0x1e: lsm303d-python: lsm303d: lsm303d 6dof motion sensor
+0x23: ltr559-python: ltr559: ltr559 proximity sensor
+0x38: bh1745-python: bh1745: bh1745 colour sensor
+0x39: bh1745-python: bh1745: bh1745 colour sensor
+0x29: vl53l1x-python: VL53L1X: vl53l1x time of flight
+0x33: mlx90640-library: mlx90460: mlx90640 thermal camera
+0x48: ads1015-python: ads1015: ads1015 ADC
+0x49: as7262-python: as7262: as7262 spectrometer
+0x57: max30105-python: max30105: max30105 heart rate, oximeter, smoke sensor
+0x58: sgp30-python: sgp30: sgp30 TVOC and CO2 sensor
+0x60: drv8830-python: drv8830: drv8830 H-bridge motor driver
+0x66: mcp9600-python: mcp9600: mcp9600 thermocouple temperature sensor
+0x67: mcp9600-python: mcp9600: mcp9600 thermocouple temperature sensor
+0x68: icm20948-python: icm20948: icm20948 9dof motion sensor
+0x69: icm20948-python: icm20948: icm20948 9dof motion sensor
+0x74: rgbmatrix5x5-python: rgbmatrix5x5: rgb 5x5 led matrix
+0x75: matrix11x7-python: matrix11x7: white 11x7 led matrix
+0x76[0xd0=0x61]: bme680-python: bme680: bme680 weather sensor
+0x76[0xd0=0x58]: bmp280-python: bmp280: bmp280 temperature and pressure sensor
+0x77[0xd0=0x61]: bme680-python: bme680: bme680 weather sensor
+0x77[0xd0=0x59]: bmp280-python: bmp280: bmp280 temperature and pressure sensor
+0x5a: drv2605-python: drv2605: drv2605 haptic driver
+0x26: msa301-python: msa301: msa3013-axis accelerometer
+0x10[0x0c=0x0026]: veml6075-python: veml6075: veml6075 uva and uvb sensor
+0x10[0x0c!=0x0026]: pa1010d-python: pa1010d: pa1010d GPS
+0x52: rv3028-python: rv3028: rv3028 real-time-clock breakout