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/notify/send_test.go

@@ -32,6 +32,7 @@ func TestSendTmuxUsesPassthroughWhenNoTTY(t *testing.T) {
 		InTmux:    true,
 		Layers:    1,
 		ClientTTY: "",
+		Method:    MethodPassthroughStdout,
 	})
 	if err != nil {
 		t.Fatal(err)