Add CI + test-settings shim + split tests into a package (#1279)

[jonfroehlich]

Closes #1279. First PR off the testing roadmap (#1278).

What & why

We started writing automated tests a few days ago (#1267), but nothing runs them automatically — and we auto-deploy master to the test server on every push, with no checks in between. This PR closes that gap with three interdependent, infra-only changes (no production code or test logic changed).

1. Test-settings shim — makeabilitylab/settings_test.py

Sets MIGRATION_MODULES = {'website': None} so the test runner builds the website schema directly from the current models instead of replaying the gitignored, per-environment website/migrations/ history. This is the durable fix for the column "..." already exists test-DB flakiness (#1267) — and a prerequisite for CI, since a clean runner has no migrations on disk. Also reads DATABASE_HOST/DATABASE_PORT from env so CI can point at its Postgres service (defaults inherit HOST='db' for local container runs).

2. GitHub Actions CI — .github/workflows/test.yml

Runs manage.py test website --settings=makeabilitylab.settings_test on every push to master and every PR, against a postgres:16 service container, after installing the same ImageMagick/Ghostscript/libpq deps the Dockerfile uses (so the Talk thumbnail path works). GitHub Actions is free + unlimited for this public repo. It reports status only — a red ✗ + email on failure; it does not block the push or the deploy. No branch protection configured.

3. Split website/tests.py → website/tests/ package

The ~1,580-line monolith becomes one test_*.py per concern (Django auto-discovers them), with shared DB fixtures in tests/base.py. Pure move: 99 tests before, 99 after, all passing.

Module	Classes
test_bio_utils.py	role/contributions/mentor-mentee sentences, HTML escaping, oxford-comma, humanize-duration
test_publication.py	BibTeX, formatted forum name, get_person
test_project.py	member count, time-worked annotation
test_artifact.py	filename-drift check, raw-file label
test_video.py	get_age_in_ms
test_serve_pdf.py	exact/fuzzy PDF resolution
test_views.py	null-author news view, talk slides URL, publications query-count
test_data_health.py	name utils + all Data Health checks/auth/CSV

Docs updated (CLAUDE.md, CONTRIBUTING.md, docs/DEPLOYMENT.md) to use the shim and document CI.

Verification

• docker exec makeabilitylabwebsite-website-1 python manage.py test website --settings=makeabilitylab.settings_test → Ran 99 tests … OK, on a clean test DB with no manual DROP DATABASE step.
• Test count unchanged across the split (99 → 99).
• CI's own run on this PR is the live check that the workflow itself is correct.

Out of scope (later PRs, tracked in #1278)

Coverage reporting, test backfill (delete_unused_files, view smoke-sweep), Pa11y-in-CI, factory_boy (#1272).

🤖 Generated with Claude Code