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/ltp305-python/library/tox.ini

@@ -0,0 +1,25 @@
+[tox]
+envlist = py{27,35,37,39},qa
+skip_missing_interpreters = True
+
+[testenv]
+commands =
+	python setup.py install
+	coverage run -m py.test -v -r wsx
+	coverage report -m
+deps =
+	mock
+	pytest>=3.1
+	pytest-cov
+
+[testenv:qa]
+commands =
+	check-manifest --ignore tox.ini,tests/*,.coveragerc
+	python setup.py sdist bdist_wheel
+	twine check dist/*
+	flake8 --ignore E501
+deps =
+	check-manifest
+	flake8
+	twine
+