bugfix: comprehensive stability audit and fixes

- discover/docker.py: handle comma-separated compose_file in labels
- discover/network.py: replace os.getlogin() with robust user detection
- target.py: add lsb_release fallback via hostnamectl, guard None compose_file,
  use container name (not cached CID) for docker logs
- main.py: call reset_state(mode='target') before target mode,
  improve EOF handling info message
- source.py: remove redundant set_stage('DONE') inside transfer_offer
- transfer.py: fix stage naming for resume after transfer
- add dry_run.py for local logic validation

discover/docker.py

@@ -74,6 +74,18 @@ def get_compose_file_from_container(inspect):
     if compose_file and os.path.isfile(compose_file):
         return compose_file
 
+    # Если labels содержит несколько файлов через запятую — берём первый существующий
+    if compose_file and ", " in compose_file:
+        for fp in compose_file.split(", "):
+            fp = fp.strip()
+            if os.path.isfile(fp):
+                return fp
+    elif compose_file and "," in compose_file:
+        for fp in compose_file.split(","):
+            fp = fp.strip()
+            if os.path.isfile(fp):
+                return fp
+
     # Fallback: ищем docker-compose.yml / compose.yml рядом с working_dir
     if working_dir and os.path.isdir(working_dir):
         for fname in ("docker-compose.yml", "docker-compose.yaml", "compose.yml", "compose.yaml"):

discover/network.py

@@ -209,7 +209,18 @@ def gather_cron_jobs(user_hint=None):
     """
     jobs = []
     # crontab -l для текущего пользователя и root
-    for user in (os.getlogin(), "root"):
+    current_user = os.environ.get('USER') or os.environ.get('LOGNAME')
+    if not current_user:
+        try:
+            import pwd
+            current_user = pwd.getpwuid(os.getuid()).pw_name
+        except Exception:
+            current_user = None
+    users = []
+    if current_user:
+        users.append(current_user)
+    users.append("root")
+    for user in users:
         try:
             out = run(f"crontab -u {user} -l", check=False)
             for ln in out.stdout.splitlines():