React Flow board (pan/zoom + frame drag are pure editor-side transforms
— zero canvas-protocol traffic, <16ms budget) hosting one iframe frame
node on the adapter origin. The frame waits for runtime.ready
(queue-drain) behind an explicit 'Starting preview…' skeleton, then
requests a single Element via render-frame (core-runner-protocol
schema) plus geometry; agent-reported geometry stays frame-local and
click reports drive store selection. The selection ring renders as an
editor-side overlay from reported geometry — chrome never inside the
customer's document (ADR-028). Stories + jsdom component tests for
board/frame/overlay; Storybook stories glob extended to
packages/editor (verified via static build).
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_016j8z4VHjedXDTjEDNg7qHK
Danijel Martinek
9495023aed