Architectural review for Pascal PRs. The user will provide a PR URL, branch name, or ask to review the current branch.

1. Load the rules (required — do not skip)

Read these before reviewing any diff. They are the source of truth, not your training data:

wiki/architecture/systems.md — core systems vs viewer systems, what each may do
wiki/architecture/renderers.md — renderer responsibilities and prohibitions
wiki/architecture/tools.md — editor tools live only in apps/editor/components/tools/
wiki/architecture/viewer-isolation.md — viewer must stay editor-agnostic
wiki/architecture/layers.md
wiki/architecture/selection-managers.md
wiki/architecture/scene-registry.md
wiki/architecture/spatial-queries.md
wiki/architecture/node-schemas.md
wiki/architecture/events.md

Only the first four are required on every review; read the rest when the diff touches their subject area.

review-architecture