Drop per-task port blocks; previews use any free loopback port

internal/terminal/terminal.go

@@ -161,7 +161,7 @@ func (ts *Terminals) start(t api.Task, name string, size api.TerminalSize) (*Ter
 	}
 	cmd := exec.Command(shell, "-l")
 	cmd.Dir = t.WorktreePath
-	cmd.Env = append(os.Environ(), "TERM=xterm-256color", "COLORTERM=truecolor", fmt.Sprintf("PORT=%d", t.PortBase))
+	cmd.Env = append(os.Environ(), "TERM=xterm-256color", "COLORTERM=truecolor")
 	prompts := filepath.Base(shell) == "zsh"
 	if prompts {
 		cmd.Env = append(cmd.Env, "BYRE_ZDOTDIR="+os.Getenv("ZDOTDIR"), "ZDOTDIR="+ts.zdotdir)