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.go

@@ -0,0 +1,29 @@
+package hook
+
+import (
+	"encoding/json"
+	"io"
+	"os"
+)
+
+func decodeJSON(r io.Reader, v any) {
+	if isInteractiveStdin(r) {
+		return
+	}
+	_ = json.NewDecoder(r).Decode(v)
+}
+
+func isInteractiveStdin(r io.Reader) bool {
+	file, ok := r.(*os.File)
+	if !ok {
+		return false
+	}
+	if file != os.Stdin {
+		return false
+	}
+	st, err := file.Stat()
+	if err != nil {
+		return false
+	}
+	return st.Mode()&os.ModeCharDevice != 0
+}