Initial scaffold: Researcher Endorsement frontend

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

.github/agents/dockerfile-generator.agent.md

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+---
+name: "Dockerfile Generator"
+description: "Generates a production-ready multi-stage Dockerfile for a Vite + React build, optimized for small image size and caching."
+triggers:
+  - "generate dockerfile"
+  - "create dockerfile for vite app"
+  - "dockerize frontend"
+---
+
+# Dockerfile Generator
+
+Purpose
+- Produce a multi-stage Dockerfile that builds the Vite project and serves the generated `dist` with nginx (recommended) or any static server.
+
+Example prompts
+- "create Dockerfile for production build"
+- "generate multi-stage Dockerfile with nginx"
+
+Sample Dockerfile
+```Dockerfile
+# builder
+FROM node:18-alpine AS builder
+WORKDIR /app
+COPY package*.json ./
+RUN npm ci --production=false
+COPY . .
+RUN npm run build
+
+# production image
+FROM nginx:stable-alpine
+COPY --from=builder /app/dist /usr/share/nginx/html
+EXPOSE 80
+CMD ["nginx", "-g", "daemon off;"]
+```
+
+Notes
+- If the app needs server-side APIs, recommend building a separate backend image and using docker-compose.
+- Provide guidance for `VITE_BASE_URL` or `--base` during build if app is served from a subpath (e.g., GitHub Pages).
+- Suggest using build cache layers (copy package.json first) to speed CI builds.