saving status before scene frame fix after rust change

cht/stream/lifecycle.py

@@ -102,6 +102,28 @@ class StreamLifecycle:
         from pathlib import Path
         from cht.config import DATA_DIR
         marker = DATA_DIR / "active-session"
+
+        # If marker exists, check liveness via data/scene.sock (fixed path).
+        if marker.exists():
+            try:
+                session_dir = Path(marker.read_text().strip())
+                scene_sock = DATA_DIR / "scene.sock"
+                if session_dir.exists() and scene_sock.exists():
+                    import socket
+                    s = socket.socket(socket.AF_UNIX, socket.SOCK_STREAM)
+                    try:
+                        s.connect(str(scene_sock))
+                        s.close()
+                        log.info("Rust session dir (already active): %s", session_dir)
+                        return session_dir
+                    except OSError:
+                        log.info("Stale scene.sock, cleaning up")
+                        scene_sock.unlink(missing_ok=True)
+                marker.unlink(missing_ok=True)
+                log.info("Cleared stale active-session marker")
+            except Exception:
+                marker.unlink(missing_ok=True)
+
         elapsed = 0.0
         while elapsed < timeout:
             if marker.exists():