fix(tracing): route action-event batch init through _initialize_batch to respect use_ephemeral

_handle_action_event called batch_manager.initialize_batch() directly,
  defaulting use_ephemeral=False. When a DefaultEnvEvent fired before
  CrewKickoffStartedEvent in the thread pool, the batch was locked in as
  non-ephemeral, causing VCR cassette path mismatches on CI. Route through
  _initialize_batch() which computes use_ephemeral from _check_authenticated().

lib/crewai/src/crewai/events/listeners/tracing/first_time_trace_handler.py

@@ -1,7 +1,7 @@
+from datetime import datetime, timezone
 import logging
 import uuid
 import webbrowser
-from datetime import datetime, timezone
 
 from rich.console import Console
 from rich.panel import Panel

lib/crewai/src/crewai/events/listeners/tracing/trace_batch_manager.py

@@ -1,8 +1,8 @@
-import time
 from dataclasses import dataclass, field
 from datetime import datetime, timezone
 from logging import getLogger
 from threading import Condition, Lock
+import time
 from typing import Any
 import uuid
 
@@ -114,10 +114,10 @@ class TraceBatchManager:
         """Send batch initialization to backend"""
 
         if not skip_context_check and not is_tracing_enabled_in_context():
-            return
+            return None
 
         if not self.plus_api or not self.current_batch:
-            return
+            return None
 
         try:
             payload = {
@@ -167,14 +167,14 @@ class TraceBatchManager:
                     f"Error initializing trace batch: {e}. Continuing without tracing."
                 )
                 self.trace_batch_id = None
-                return
+                return None
 
             if response is None:
                 logger.warning(
                     "Trace batch initialization failed gracefully. Continuing without tracing."
                 )
                 self.trace_batch_id = None
-                return
+                return None
 
             # Fall back to ephemeral on auth failure (expired/revoked token)
             if response.status_code in [401, 403] and not use_ephemeral:

lib/crewai/src/crewai/events/listeners/tracing/trace_listener.py

@@ -780,7 +780,7 @@ class TraceCollectionListener(BaseEventListener):
                 "crew_name": getattr(source, "name", "Unknown Crew"),
                 "crewai_version": get_crewai_version(),
             }
-            self.batch_manager.initialize_batch(user_context, execution_metadata)
+            self._initialize_batch(user_context, execution_metadata)
 
         self.batch_manager.begin_event_processing()
         try: