feat: add hooks and rules

.claude/hooks/notify.cjs

@@ -0,0 +1,40 @@
+#!/usr/bin/env node
+/**
+ * Notification hook: cross-platform desktop notification.
+ * Supports macOS (osascript), Linux (notify-send), and Windows (PowerShell).
+ * Fails open — notification errors are silently ignored.
+ */
+"use strict";
+
+const { execSync } = require("child_process");
+const os = require("os");
+
+function notify(title, message) {
+  const platform = os.platform();
+
+  const commands = {
+    darwin: `osascript -e 'display notification "${message}" with title "${title}"'`,
+    linux: `notify-send "${title}" "${message}"`,
+    win32: `powershell.exe -Command "Add-Type -AssemblyName System.Windows.Forms; [System.Windows.Forms.MessageBox]::Show('${message}', '${title}', 'OK', 'Information')"`,
+  };
+
+  const cmd = commands[platform];
+  if (cmd) {
+    execSync(cmd, { stdio: "ignore", timeout: 5000 });
+  }
+}
+
+async function main() {
+  try {
+    let data = "";
+    for await (const chunk of process.stdin) data += chunk;
+    const input = JSON.parse(data);
+
+    const message = input?.message ?? "Needs your attention";
+    notify("Claude Code", message);
+  } catch {
+    // Fail open — notification errors should never block work
+  }
+}
+
+main();