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/setup.cfg

@@ -0,0 +1,49 @@
+# -*- coding: utf-8 -*-
+[metadata]
+name = ltp305
+version = 0.0.1
+author = Philip Howard
+author_email = phil@pimoroni.com
+description = Python library for dual LTP305 LED matrix breakout
+long_description = file: README.md
+long_description_content_type = text/markdown
+keywords = Raspberry Pi
+url = https://www.pimoroni.com
+project_urls =
+	GitHub=https://www.github.com/pimoroni/ltp305-python
+license = MIT
+# This includes the license file(s) in the wheel.
+# https://wheel.readthedocs.io/en/stable/user_guide.html#including-license-files-in-the-generated-wheel-file
+license_files = LICENSE.txt
+classifiers =
+	Development Status :: 4 - Beta
+	Operating System :: POSIX :: Linux
+	License :: OSI Approved :: MIT License
+	Intended Audience :: Developers
+	Programming Language :: Python :: 2.7
+	Programming Language :: Python :: 3
+	Topic :: Software Development
+	Topic :: Software Development :: Libraries
+	Topic :: System :: Hardware
+
+[options]
+python_requires = >= 2.7
+packages = ltp305
+install_requires = smbus2
+
+[flake8]
+exclude =
+	.tox,
+	.eggs,
+	.git,
+	__pycache__,
+	build,
+	dist
+ignore =
+	E501
+
+[pimoroni]
+py2deps =
+py3deps =
+configtxt =
+commands =