model.py imported its exceptions from the package __init__, which itself
imports model -- a cycle that only resolved because __init__ happens to
import exceptions first. Import them from the exceptions submodule
directly, matching service.py, so reordering __init__ can never break
collection.
Also update the two module docstrings that still pointed readers at the
deleted app/infra/ layout and the old deps.py wiring: adapters live in
app/adapters/{context}/ and wiring happens in the composition root,
app/composition.py::build_domain_services.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Hexagonal inner ring for the feedback bounded context: frozen aggregate
with construct-time invariants (rating, reason-tag slugs), technology-
neutral ports (typing.Protocol), and the application service with
explicit user_id. Guarded by an AST purity test that keeps domain/ free
of infrastructure imports.
