diff --git a/.cursor/rules/demos-pages.mdc b/.cursor/rules/demos-pages.mdc
index 43d2c6a..13b77ac 100644
--- a/.cursor/rules/demos-pages.mdc
+++ b/.cursor/rules/demos-pages.mdc
@@ -22,6 +22,7 @@ Source of truth: `demos/README.md` and `demos/assemble-pages.sh`. Keep the READM
 - Publish when there is no `vercel.json` and either:
   - no `package.json` + root `index.html` → copy the **whole folder**;
   - `package.json` + `package-lock.json` (or `npm-shrinkwrap.json`) → `rm -rf dist && npm ci --no-audit --no-fund && npm run build`, publish `dist/` (must contain `dist/index.html`). Fail fast if the lockfile is missing.
+- Progress / `npm` output: stderr only. The `{ ... } > index.html` block must not capture build logs.
 - Vite: `base: './'`. Do not commit `node_modules/` or `dist/`.
 
 ## Workflow
diff --git a/demos/README.md b/demos/README.md
index 0f85240..6341e17 100644
--- a/demos/README.md
+++ b/demos/README.md
@@ -31,6 +31,7 @@ Official static host: [https://robotemi.github.io/openapi/](https://robotemi.git
 | Demo | Mode | Deploy |
 |------|------|--------|
 | [mvp-frontend-only](mvp-frontend-only/) | Client-only (browser → temi API) | [https://robotemi.github.io/openapi/mvp-frontend-only/](https://robotemi.github.io/openapi/mvp-frontend-only/) |
+| [temi-openapi-scenario-runner](temi-openapi-scenario-runner/) | Client-only (Vite/TypeScript, browser → temi API) | [https://robotemi.github.io/openapi/temi-openapi-scenario-runner/](https://robotemi.github.io/openapi/temi-openapi-scenario-runner/) |
 
 ## Contributing
 
diff --git a/demos/assemble-pages.sh b/demos/assemble-pages.sh
index 51c7973..1c9513d 100755
--- a/demos/assemble-pages.sh
+++ b/demos/assemble-pages.sh
@@ -71,8 +71,8 @@ EOF
                 echo "assemble-pages: $name has package.json but no package-lock.json (or npm-shrinkwrap.json); npm ci requires a lockfile" >&2
                 exit 1
             fi
-            echo "assemble-pages: building $name"
-            (cd "$dir" && rm -rf dist && npm ci --no-audit --no-fund && npm run build)
+            echo "assemble-pages: building $name" >&2
+            (cd "$dir" && rm -rf dist && npm ci --no-audit --no-fund && npm run build) >&2
             if [ ! -f "${dir}dist/index.html" ]; then
                 echo "assemble-pages: $name build produced no dist/index.html" >&2
                 exit 1