plan-canvas

# 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](https://github.com/kunchenguid/lavish-axi); rebuilt ECC-native around the `/plan` confirmation gate, with zero dependencies. ## When to Use - You just wrote a plan artifact (`.claude/plans/*.plan.md` from `/plan`) and need the CONFIRM/approve decision — the canvas verdict replaces a typed "yes/proceed". - The user should *point at* what to change: reviewing designs, comparisons, reports, or any local `.md` / `.html` artifact. - The user asks for `/plan-canvas`, a visual review, or "open it in the browser". Do NOT use for: code review of diffs (`/code-review`), running web apps, or remote URLs. The canvas serves local artifact files only. ## How It Works Invoke the CLI as `ecc-plan-canvas` — the bin shipped by the `ecc-universal` package (on PATH after a global/plugin install; `node "$CLAUDE_PLUGIN_ROOT/scripts/plan-canvas.js"` also works for plugin installs). Run it from the project you are reviewing in; it works from any working directory. It manages a detached loopback server (`127.0.0.1:4517`) shared by all sessions, keyed by artifact path — no session ids to track. The workflow is a plain CLI-plus-JSON loop, so it is model- and harn...