feat: MQTT / Home Assistant bridge + modern packaging

[JarbasAl]

Turns PowerGuess into a Home Assistant power sensor for headless Linux devices (Raspberry Pi, mini PC, SBC, laptop) that have no smart plug, and decouples the core from OVOS.

What's new

• python -m powerguess — publishes power/current/voltage (and battery on devices that have one) to MQTT with Home Assistant auto-discovery, mirroring the sibling vad2mqtt/shazam2mqtt bridges.
• Env-var config, Dockerfile + docker-compose.yml, GHCR build workflow, and HA docs with a dashboard card + Energy-dashboard recipe.
• Core (guess/utils/mqtt_client/config) no longer imports OVOS; the PHAL sensor integration moved behind the phal extra.

Modernization

• PEP 621 pyproject (dynamic version), Apache-2.0, gh-automations reusable CI @dev.
• Offline pytest suite (battery//sys reads mocked) — 19 tests, 68% coverage.

Bugs fixed along the way

• from distutils.spawn import find_executable → shutil.which (distutils is removed in 3.12+, so the package failed to import on the CI matrix).
• transform_range was missing the output offset — the idle estimate returned 0 W instead of idle power.
• No benchmark profile loaded when the device model is unidentifiable → guesstimate crashed; now falls back to a generic profile.
• Model filename mismatches (pi3b+.json/pi2.json → pi3bplus.json/pi2b.json).

🤖 Generated with Claude Code

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