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

src/assets/css/components/global-bar.css

@@ -0,0 +1,63 @@
+/* ==========================================================================
+   Global Status Header Bar (components/global-bar.css)
+   ========================================================================== */
+
+.global-bar {
+  background-color: var(--bg-surface);
+  border: var(--border-width) solid var(--border-color);
+  border-radius: var(--border-radius);
+  padding: 10px 18px;
+  display: flex;
+  justify-content: space-between;
+  align-items: center;
+  font-family: var(--font-mono);
+  font-size: 0.8rem;
+  flex-wrap: wrap;
+  gap: 10px;
+}
+
+.brand-group {
+  display: flex;
+  align-items: center;
+  gap: 10px;
+  color: var(--text-primary);
+  font-weight: 700;
+  text-decoration: none;
+}
+
+.brand-group:hover {
+  color: var(--accent-cyan);
+}
+
+.status-indicator {
+  width: 8px;
+  height: 8px;
+  background-color: var(--accent-green);
+  display: inline-block;
+}
+
+.bar-nav {
+  display: flex;
+  gap: 14px;
+  align-items: center;
+}
+
+.bar-link {
+  color: var(--text-muted);
+  text-decoration: none;
+}
+
+.bar-link:hover {
+  color: var(--accent-cyan);
+}
+
+.bar-link.active {
+  color: var(--text-primary);
+  border-bottom: 1px solid var(--accent-cyan);
+}
+
+.bar-link.external::after {
+  content: " ↗";
+  font-size: 0.75em;
+  color: var(--text-muted);
+}