Stands up the first automated tests for the repo (151 tests) and turns on
the CI test step.
- Lift slack-bot handlers out of create_app() closures to module level so
they're unit-testable; create_app is now a thin Bolt-wiring layer. No
behavior change (handler entrypoints and create_app signature unchanged).
- tests/ mirrors src/: shared layer (schedule, blocks, 3CX client,
ring_scheduler, secrets) + all four Lambdas (pay math, drop/swap/pick/
admin/register/rate, pickup button, roster sync, queue scheduler).
- All boundaries mocked: DynamoDB/SES/Secrets via moto, 3CX HTTP via
responses, Slack via fakes, time via freezegun. No real network/AWS.
- pyproject.toml pytest config (pythonpath=src/shared, importlib mode);
per-package conftest loads each app.py under a unique name to avoid the
four-app.py collision. tests/requirements.txt for test-only deps.
- ci.yaml: run-tests: true (reusable workflow auto-installs deps) and lint
the tests dir too.
- README Testing section.
Closes#85
