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/tmux/env.go

@@ -0,0 +1,7 @@
+package tmux
+
+import "os"
+
+func IsSSHSession() bool {
+	return os.Getenv("SSH_CONNECTION") != "" || os.Getenv("SSH_CLIENT") != ""
+}