Format: Plan for
plan-runnerskill execution. Each## Phase <code-name>section is one plan-runner invocation. Phases with### Verifysections ending incargo build/testoruv run pytestare automatically verifiable. Phases requiring running SketchUp or Tauri dev are manual verification only.
Integration of VCAD BRep kernel into SketchUp via the existing supex extension. The agent writes parametric CAD code in Loon (a Lisp with algebraic data types, type inference and square-bracket syntax), the VCAD Rust sidecar evaluates the code to produce a VCAD IR Document, evaluates it into BRep geometry, exports the resulting mesh as COLLADA DAE, and SketchUp natively imports it as a component. A standalone Tauri viewer provides high-fidelity BRep preview — the agent can read viewer state (camera, selection, annotations) and use it as context for agentic coding over the user's Loon project.