server: remove OLLIE_*_PATH SetEnv calls

OLLIE_MEMORY_PATH and OLLIE_PLAN_PATH are now configured via sandbox
yaml overlays rather than injected at session creation. Remove the
SetEnv calls so the sandbox can pick them up from the environment if
the user has set them.

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

internal/p9/server.go

@@ -1258,8 +1258,6 @@ func (s *Server) createSession(args []string) error {
 	if srv, ok := env.Dispatcher().GetServer("execute"); ok {
 		if es, ok := srv.(tools.EnvSetter); ok {
 			es.SetEnv("OLLIE_SESSION_ID", sessID)
-			es.SetEnv("OLLIE_MEMORY_PATH", s.memDir)
-			es.SetEnv("OLLIE_PLAN_PATH", s.planDir)
 		}
 	}