Initial scaffold: spec, architecture playbook, and M0 skeleton

package.json

@@ -0,0 +1,36 @@
+{
+  "name": "astrolabe",
+  "version": "0.1.0",
+  "private": true,
+  "type": "module",
+  "description": "A browser-based snippet manager for Vega-Lite visualizations.",
+  "scripts": {
+    "dev": "vite",
+    "build": "tsc --noEmit && vite build",
+    "preview": "vite preview",
+    "typecheck": "tsc --noEmit",
+    "test": "vitest run",
+    "test:watch": "vitest",
+    "format": "prettier --write ."
+  },
+  "dependencies": {
+    "monaco-editor": "^0.54.0",
+    "react": "^19.2.7",
+    "react-dom": "^19.2.7",
+    "vega": "^6.2.0",
+    "vega-embed": "^7.1.0",
+    "vega-lite": "^6.4.2",
+    "zustand": "^5.0.14"
+  },
+  "devDependencies": {
+    "@types/react": "^19.2.16",
+    "@types/react-dom": "^19.2.3",
+    "@vitejs/plugin-react": "^5.2.0",
+    "happy-dom": "^20.0.0",
+    "prettier": "^3.6.2",
+    "typescript": "^5.9.2",
+    "vite": "^7.1.0",
+    "vite-plugin-pwa": "^1.0.3",
+    "vitest": "^3.2.4"
+  }
+}