docs: sync after #394 (site page count, site assembly inputs)

CONTRIBUTING.md

@@ -134,11 +134,15 @@ screenshots in `docs/images/` change, because the website bundles some of them.
 
 - `npm run dev:site` serves the website alone on port 5175 — enough for work on the website itself.
 - `npm run build:site` builds it into `dist-site/`.
-- `npm run assemble:site` runs `scripts/assemble-site.mjs`: from the two finished builds it
+- `npm run build:demo` builds the browser demo in the neighbouring package
+  (`src/nodepilot-ui` → `dist-demo/`).
+- `npm run assemble:site` runs `scripts/assemble-site.mjs`: from the three finished builds it
   assembles `_site/` exactly as the workflow publishes it — the website at the root, the docs in
-  `docs/`, `pages-media/` in `media/`.
-- `npm run preview:site` runs both builds and the assembly, then serves `_site/` on port 5175. It
-  is the only complete local preview: `docs/` and `media/` exist only in the assembled `_site/`.
+  `docs/`, the demo in `demo/`, `pages-media/` in `media/`. Every input is required, so a missing
+  build fails the assembly instead of publishing a site that keeps the previous demo.
+- `npm run preview:site` runs all three builds and the assembly, then serves `_site/` on port 5175.
+  It is the only complete local preview: `docs/`, `demo/` and `media/` exist only in the assembled
+  `_site/`.
 
 Old documentation links without `/docs/` (`#/en/deployment/logs` at the site root) keep working:
 `src/site/public/legacy-docs-redirect.js` forwards every hash that is not a website route to

README.md

@@ -441,7 +441,7 @@ laid out to fill the canvas width and run top-to-bottom.
 ## Documentation
 
 Everything below the surface lives on the **[documentation site](https://sev7enup.github.io/NodePilot/docs/)**
-— 43 pages in English and German, with search and deep links. This README deliberately stops at
+— 44 pages in English and German, with search and deep links. This README deliberately stops at
 "installed and logged in".
 
 | | |
@@ -587,7 +587,7 @@ NodePilot is licensed under the [Apache License 2.0](LICENSE). You are free to u
 
 ## Further Reading
 
-- **[📚 sev7enup.github.io/NodePilot/docs](https://sev7enup.github.io/NodePilot/docs/)** — the documentation website: 43 pages in English and German, with search, sidebar navigation and light/dark themes. Start at [Introduction](https://sev7enup.github.io/NodePilot/docs/#/en/getting-started/introduction) or jump to [Installation](https://sev7enup.github.io/NodePilot/docs/#/en/getting-started/installation). **The same site ships with the product** — every installation serves it at `/docs`, without a login and without internet access, at the version actually installed.
+- **[📚 sev7enup.github.io/NodePilot/docs](https://sev7enup.github.io/NodePilot/docs/)** — the documentation website: 44 pages in English and German, with search, sidebar navigation and light/dark themes. Start at [Introduction](https://sev7enup.github.io/NodePilot/docs/#/en/getting-started/introduction) or jump to [Installation](https://sev7enup.github.io/NodePilot/docs/#/en/getting-started/installation). **The same site ships with the product** — every installation serves it at `/docs`, without a login and without internet access, at the version actually installed.
 - **[CLAUDE.md](CLAUDE.md)** — architecture conventions, full activity/trigger reference, variable resolution details, edge-condition grammar, test guidelines, and the complete API endpoint table.
 - **[src/nodepilot-docs-ui/](src/nodepilot-docs-ui/)** — standalone documentation website (Vite + React SPA) with client-side search, sidebar navigation, light/dark theme, and **English/German** via i18next (the language lives in the route: `#/en/…`, `#/de/…`). Note: it ships its own curated markdown corpus under `content/en/` and `content/de/` — changes to `docs/` must be mirrored there deliberately (it is not a 1:1 render), and both languages must be kept in step or the parity test fails. It has two deployments: GitHub Pages, which publishes the project website at the site root and the documentation under `/docs/`, and `wwwroot/docs` inside the server artifact and desktop package, which the API serves at `/docs`. The project website (`src/site/`, English and German) is a separate build that only goes to GitHub Pages; the product ships the documentation alone.
 - **[docs/workflow-designer-features.md](docs/workflow-designer-features.md)** — complete feature inventory of the workflow designer (canvas, nodes, edges, properties, overlays, modes, shortcuts, mobile), organized by area.