chore: import upstream snapshot with attribution

workflow/runtime/result_archiver.py

@@ -0,0 +1,32 @@
+"""Utilities for persisting execution artifacts."""
+
+from utils.log_manager import LogManager
+from utils.token_tracker import TokenTracker
+from workflow.graph_context import GraphContext
+
+
+class ResultArchiver:
+    """Handles post-execution persistence (tokens, logs, metadata)."""
+
+    def __init__(
+        self,
+        graph: GraphContext,
+        log_manager: LogManager,
+        token_tracker: TokenTracker,
+    ) -> None:
+        self.graph = graph
+        self.log_manager = log_manager
+        self.token_tracker = token_tracker
+
+    def export(self, final_result: str) -> None:
+        token_usage_path = self.graph.directory / f"token_usage_{self.graph.name}.json"
+        self.token_tracker.export_to_file(str(token_usage_path))
+        self.log_manager.record_workflow_end(
+            success=True,
+            details={
+                "token_usage": self.token_tracker.get_token_usage(),
+                "final_result": final_result,
+            },
+        )
+        log_file_path = self.graph.directory / "execution_logs.json"
+        self.log_manager.save_logs(str(log_file_path))