session: remove dead env map (was stored but never read back)

session/session.go

@@ -61,10 +61,6 @@ type Session struct {
 	log         *olog.Logger
 	sessionsDir string
 
-	// Environment
-	envMu sync.RWMutex
-	env   map[string]string
-
 	// Mutable state protected by mu
 	mu        sync.RWMutex
 	name      string        // friendly name
@@ -175,7 +171,6 @@ func New(cfg Config) *Session {
 		ID:          cfg.SessionID,
 		name:        name,
 		Remote:      cfg.Remote,
-		env:         make(map[string]string),
 		agents:      make([]*agent.Agent, 0, 1),
 		log:         log,
 		sessionsDir: cfg.SessionsDir,
@@ -255,9 +250,6 @@ func (s *Session) Close() {
 
 // SetEnv stores a session-scoped variable and propagates to all agents.
 func (s *Session) SetEnv(key, value string) {
-	s.envMu.Lock()
-	s.env[key] = value
-	s.envMu.Unlock()
 	for _, ag := range s.agents {
 		ag.SetEnv(key, value)
 	}
@@ -467,7 +459,6 @@ func NewEmpty(id string, ctx context.Context, cancel context.CancelFunc) *Sessio
 		name:        name,
 		Ctx:         ctx,
 		Cancel:      cancel,
-		env:         make(map[string]string),
 		agents:      make([]*agent.Agent, 0),
 		log:         log,
 		sessionsDir: pkgSessionsDir,