wip: course website (incomplete — Task 15 in progress)

Partial: Astro Starlight config, sync-content.mjs + 6 passing tests.
Missing: pages (index, disclaimer, about), harness page, lockfile,
verified build. See SDD ledger.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

site/package.json

@@ -0,0 +1,19 @@
+{
+  "name": "systemic-design-course-site",
+  "private": true,
+  "type": "module",
+  "license": "MIT",
+  "scripts": {
+    "sync": "node scripts/sync-content.mjs",
+    "predev": "npm run sync",
+    "dev": "astro dev",
+    "prebuild": "npm run sync",
+    "build": "astro build",
+    "preview": "astro preview",
+    "test": "node --test scripts/*.test.mjs"
+  },
+  "dependencies": {
+    "@astrojs/starlight": "0.42.7",
+    "astro": "7.4.4"
+  }
+}