Add geometry-backed ArticulationPlan and realize(), wire articulation into ChatRuntime and trace output, expose proposition relation_norm, and add articulation/runtime/CLI tests.
Add RuntimeConfig with English default output policy, wire output language through runtime/frame selection/generation/CLI, preserve language metadata in mounted manifolds, and add runtime/CLI policy tests.
* Make core CLI help robust and intuitive
* Package runtime support modules for core CLI
* Add CLI help and doctor tests
* Fix CLI trace help and pack listing
* Export language pack listing helper
* Bootstrap repo root for console runtime imports
* Align trace formatter with Proposition schema
* Cover real trace payload formatting
