feat: «Здесь» from a machine's file pane opens the terminal in that pane's folder (the agent starts the shell there; an older agent, or a folder gone, at home)

internal/proto/proto.go

@@ -63,6 +63,7 @@ type ControlMessage struct {
 	Port      int        `json:"port,omitempty"`    // CtrlOpenForward: client-side port to dial
 	TaskID    string     `json:"task_id,omitempty"` // CtrlTask
 	User      string     `json:"user,omitempty"`    // CtrlOpenTerminal: OS user for the shell ("" = the agent's own)
+	Dir       string     `json:"dir,omitempty"`     // CtrlOpenTerminal: the folder to start in ("" or missing = home)
 	SSH       *SSHTarget `json:"ssh,omitempty"`     // CtrlOpenSSH
 }