Plan Canvas Review loop for plans and visual artifacts: you write the artifact, the human reviews it in the browser — annotating the exact element they mean, chatting, and delivering an Approve plan / Request changes verdict — while you block on a single CLI call that returns their feedback as JSON. Inspired by lavish-axi; rebuilt ECC-native around the confirmation gate, with zero dependencies. When to Use - You just wrote a plan artifact ( from ) and need the CONFIRM/approve decision — the canvas verdict replaces a typed "yes/proceed". - The user should point at what to change: reviewing des…