Document the existing convention: use @dataclass for frames and
internal pipeline data, use Pydantic BaseModel for configuration,
parameters, metrics, and external API data.
Extract the procedural PR workflow into an actionable skill that can be
invoked with /pr-submit. CLAUDE.md is better suited for project context
and conventions, not step-by-step procedures.
Expand the Pull Requests section with detailed step-by-step instructions
including branch naming, commit guidance, changelog generation, and PR
description updates.