style: run prettier on entire codebase

.claude/hooks/format-on-save.js

@@ -0,0 +1,13 @@
+// Auto-format edited files with prettier
+const { execSync } = require('child_process');
+let data = '';
+process.stdin.on('data', chunk => data += chunk);
+process.stdin.on('end', () => {
+  try {
+    const input = JSON.parse(data);
+    const filePath = input.tool_response?.filePath || input.tool_input?.file_path || '';
+    if (filePath) {
+      execSync(`npx prettier --write "${filePath}" --ignore-unknown`, { stdio: 'ignore', timeout: 10000 });
+    }
+  } catch {}
+});