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/layers.md
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/ or packages/nodes/src/<kind>/
wiki/architecture/viewer-isolation.md — viewer must stay editor-agnostic
wiki/architecture/node-definitions.md — the three-checkbox composition model (geometry / renderer / system)
wiki/architecture/plugin-authoring.md — public contract for external node packs

Required on every review. Read the remaining pages on demand when the diff touches their subject area:

review-architecture