feat: fix Cursor hook delivery and improve notify workflow

Route hook notifications through /dev/tty and client_tty so OSC reaches
Ghostty when Cursor captures stdout. Add afterAgentResponse hook, hook
logging, debounce, split test modes, and use directory name for titles.

Co-authored-by: Cursor <cursoragent@cursor.com>

internal/hook/stdin_test.go

@@ -0,0 +1,24 @@
+package hook
+
+import (
+	"bytes"
+	"testing"
+
+	"github.com/longbin/agent-notify/internal/config"
+)
+
+func TestRunCursorEmptyStdinDoesNotBlock(t *testing.T) {
+	cfg := config.Default()
+	err := RunCursor(bytes.NewReader(nil), cfg, "stop", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestRunCursorWithPayload(t *testing.T) {
+	cfg := config.Default()
+	err := RunCursor(bytes.NewReader([]byte(`{"workspace_roots":["/tmp/proj"]}`)), cfg, "stop", nil)
+	if err != nil {
+		t.Fatal(err)
+	}
+}