fix: update session_log_file during context compression (#3835)

When compression creates a child session with a new session_id,
session_log_file was still pointing to the old session's JSON file.
This caused _save_session_log() to write new data to the wrong file.

Closes #3731.

Co-authored-by: kelsia14 <kelsia14@users.noreply.github.com>

run_agent.py

@@ -5183,6 +5183,8 @@ class AIAgent:
                 self._session_db.end_session(self.session_id, "compression")
                 old_session_id = self.session_id
                 self.session_id = f"{datetime.now().strftime('%Y%m%d_%H%M%S')}_{uuid.uuid4().hex[:6]}"
+                # Update session_log_file to point to the new session's JSON file
+                self.session_log_file = self.logs_dir / f"session_{self.session_id}.json"
                 self._session_db.create_session(
                     session_id=self.session_id,
                     source=self.platform or os.environ.get("HERMES_SESSION_SOURCE", "cli"),