chore: add minimal validation — format, typecheck, CI

.github/dependabot.yml

@@ -1,19 +1,19 @@
 version: 2
 updates:
-  - package-ecosystem: "npm"
-    directory: "/"
+  - package-ecosystem: 'npm'
+    directory: '/'
     schedule:
-      interval: "weekly"
+      interval: 'weekly'
     groups:
       npm-dependencies:
         patterns:
-          - "*"
+          - '*'
 
-  - package-ecosystem: "github-actions"
-    directory: "/"
+  - package-ecosystem: 'github-actions'
+    directory: '/'
     schedule:
-      interval: "weekly"
+      interval: 'weekly'
     groups:
       actions-dependencies:
         patterns:
-          - "*"
+          - '*'

.github/workflows/ci.yml

@@ -0,0 +1,35 @@
+name: CI
+
+on:
+  pull_request:
+  push:
+    branches: [main]
+
+concurrency:
+  group: ci-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v7
+
+      - name: Set up Node.js
+        uses: actions/setup-node@v5
+        with:
+          node-version: 22
+          cache: npm
+
+      - name: Install dependencies
+        run: npm ci
+
+      - name: Check formatting
+        run: npm run format:check
+
+      - name: Type check
+        run: npm run typecheck
+
+      - name: Build
+        run: npm run build

.prettierignore

@@ -0,0 +1,8 @@
+dist/
+.astro/
+node_modules/
+package-lock.json
+
+# org-facing content, not site source — left as authored
+README.md
+profile/

.prettierrc.json

@@ -0,0 +1,15 @@
+{
+  "singleQuote": true,
+  "semi": true,
+  "printWidth": 100,
+  "trailingComma": "all",
+  "plugins": ["prettier-plugin-astro"],
+  "overrides": [
+    {
+      "files": "*.astro",
+      "options": {
+        "parser": "astro"
+      }
+    }
+  ]
+}