Add tests

[marcogobbo]

Add test suite, CI, and main-branch protection

Hardens the project so new features reach main only through a reviewed, CI-passing PR. Adds an automated test suite, a GitHub Actions pipeline, and local pre-commit enforcement.

Tests

Adds a pytest suite (66 tests) covering the pure logic plus light, mocked cog tests:

• test_uta_parser.py — UTA CGI HTML parser: timestamp parsing + fallback, analog grabs, the rirpresa typo tolerance, season→setpoint routing, alarm/state phrase inference, chiller alarm discrimination, and UtaSnapshot property truth tables.
• test_proteox_snapshot.py — Snapshot.status/is_idle/temperature_value and SensorReading.formatted (heater OFF, N/A, Out of range).
• test_fridge_config.py — loads the real config/*.yaml, validates pt2_key, and rejects unknown quantities.
• test_settings.py — env-driven loading: full fridge, incomplete-fridge skip, zero-fridges error, invalid destination type.
• test_cogs.py— mocked ReportsCog routing/ephemeral-defer and SchedulerCog skip-vs-post decisions (idle+warm, running, idle+cold, LOCAL mode).
• conftest.py provides shared UTA HTML fixtures; test_units.py extended with magnetic-field, negative, and sub-prefix cases.

Tooling

• Added black, mypy, and pre-commit as dev dependencies with [tool.black] and a pragmatic [tool.mypy] baseline.
• .pre-commit-config.yamlruns trailing-whitespace/EOF/yaml checks, black, ruff, and mypy (mypy hook given the project's typed deps so it matches poetry run mypy).

CI (.github/workflows/ci.yml)

Runs on PRs to main:

• lint — pre-commit (ruff + black + mypy + basic hooks).
• test (3.11) / test (3.12) — pytest across both Python versions.

Incidental fixes surfaced by the new checks

• Corrected a wrong unit-test assertion (500 Pa renders as 500.0 Pa, not 0.5 kPa).
• Removed an unused timezone import in monday.py.
• Removed stale # type: ignore comments and added a missing assert in proteox.py for a
• Updated README (Contributing section + corrected the daily-report gating description from mixing-chamber to PT2).

Follow-up (manual, post-merge)

Enable branch protection on main: require a PR, 1 approval, dismiss stale approvals, lint, test (3.11), test (3.12). (Requires the workflow to have run once so the check names
register.)

Verification

pytest (66 passed), ruff, black --check, mypy src, and pre-commit run --all-files all