Introduce SCOPE, expanded README, CONTRIBUTING, and provisional open-question
defaults. Rescope Trust Service work to offline schemas/fold/fixtures, add
normative core extraction workplan, and split PRD roadmap Phase 4 into
foundation vs hosted service. Sync workplans with State Hub.
Source of truth for the state hub's domain/secondary-domain assignment,
synced via register_repo_from_classification.
Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
