Five tasks, each ending in a green test run and a commit: the pure
selection module, the endpoint key, the section and its two client
islands, the wiring into both templates, and the journey.
The selection logic gets its own module rather than another 200 lines in
app.py, which means the tier rules are testable against a synthetic frame
with no TestClient, no database and no monkeypatch. Moving PHASE_GROUPS
to schemas.py is what keeps that import acyclic.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
