fix: start FUSE mount for remote sessions

Remote sessions had no local mount because WithMount9P hooks into the
local execute.Server which does not exist for remote sessions. Start
the mount directly and tear it down on kill/shutdown.

session/session.go

@@ -39,6 +39,7 @@ type Session struct {
 	prevPrompt []byte // last submitted prompt; overwritten on each new submission
 	peers      map[string]bool // peer session IDs (bidirectional links)
 	remote     string // SSH target for remote execution (empty = local)
+	mount      *mountState // non-nil for remote sessions that need a local mount
 
 	// Cached model list (expensive API call; refreshed every 24h).
 	modelsMu      sync.Mutex
@@ -847,6 +848,9 @@ func (s *Manager) Shutdown() {
 		if sess != nil {
 			sess.Cancel()
 			sess.Core.Close()
+			if sess.mount != nil {
+				teardownMount(sess.mount)
+			}
 			s.cfg.Log.Info("shutdown session %s", id)
 		}
 	}
@@ -860,6 +864,9 @@ func (s *Manager) KillSession(id string) {
 	if sess != nil {
 		sess.Cancel()
 		sess.Core.Close()
+		if sess.mount != nil {
+			teardownMount(sess.mount)
+		}
 		s.removePersistedSession(id)
 		s.cfg.Log.Info("killed session %s", id)
 		if s.cfg.OnSessionKilled != nil {
@@ -1046,6 +1053,15 @@ func (s *Manager) CreateSession(args []string) (string, error) {
 	sessPtr = sess
 	sess.remote = remoteTarget
 
+	// For remote sessions, the mount isn't managed by a local execute.Server
+	// (which doesn't exist). Start it directly so $OLLIE is available for
+	// local prompt resolution.
+	if remoteTarget != "" && !s.cfg.NoMount {
+		ms := &mountState{envExtra: make(map[string]string)}
+		startMount(ms, uname)
+		sess.mount = ms
+	}
+
 	s.mu.Lock()
 	sess.uname = uname
 	s.sessions[sessID] = sess