- command-ify the write use cases (RateRun / RetractRunRating; queries
keep plain parameters, commands stay dumb data)
- split the domain errors into exceptions.py, a peer of model.py
(PEP 8 Error suffixes, AWS-style module name)
- unify the aggregate->row mapping as _apply(row, feedback) so one
explicit field list serves both the insert and the update path
- drop the unused feedback.message_id column (migration 0011): feedback
is bound to a run, nothing ever wrote or read the field
- pin remove_for_run's equality semantics for user_id=None in the
contract suite and fix the port docstring that contradicted both
implementations
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.
