feat: implement dynamic Eleventy tiling blog, modular CSS, and agent customizations

- Add project foundation README.md and root AGENTS.md for pair programming
- Configure .agents/ rules and skills for Eleventy tiling and Obsidian publishing
- Decompose monolithic styles into modular tokens, reset, layout, and component CSS
- Implement Nunjucks layout inheritance (base.njk, post.njk, page.njk) and reusable partials
- Configure Eleventy 3 with markdown-it-anchor, syntax highlighting, and dynamic collections
- Migrate sample prototypes into dynamic dispatches lander, gateway, and Markdown posts
- Add multi-stage Dockerfile and clean-URL nginx.conf for production serving

Dockerfile

@@ -1,15 +1,29 @@
+# Stage 1: Build static site with Node
+FROM node:22-alpine AS builder
+
+WORKDIR /app
+
+# Copy dependency definitions and install
+COPY package*.json ./
+RUN npm ci
+
+# Copy source files and compile static output via Eleventy
+COPY . .
+RUN npm run build
+
+# Stage 2: Serve static output via lightweight Alpine Nginx
 FROM nginx:1.25-alpine
 
 # Remove default Nginx configuration
 RUN rm /etc/nginx/conf.d/default.conf
 
-# Copy custom Nginx security & performance config
+# Copy custom Nginx security & clean-URL configuration
 COPY nginx.conf /etc/nginx/conf.d/default.conf
 
-# Copy static website files into Nginx server root
-COPY . /usr/share/nginx/html
+# Copy compiled static website files from builder stage
+COPY --from=builder /app/_site /usr/share/nginx/html
 
-# Expose standard HTTP port
+# Expose HTTP port
 EXPOSE 80
 
 CMD ["nginx", "-g", "daemon off;"]