feat: align Hamilton cache path with workflow save path

src/fasthep_flow/cli.py

@@ -61,7 +61,7 @@ def execute(
     cfg = init_config(config, overrides)
     workflow = Workflow(config=cfg)
     save_path = workflow.save(Path(save_path))
-    dag = workflow_to_hamilton_dag(workflow)
+    dag = workflow_to_hamilton_dag(workflow, save_path)
     dag.visualize_execution(
         final_vars=workflow.task_names,
         output_file_path=Path(workflow.save_path) / "dag.png",

src/fasthep_flow/orchestration.py

@@ -6,6 +6,7 @@
 from __future__ import annotations
 
 import logging
+from pathlib import Path
 from typing import Any
 
 from hamilton import driver, telemetry
@@ -39,10 +40,15 @@
 #     return client
 
 
-def workflow_to_hamilton_dag(workflow: Workflow) -> Any:
+def workflow_to_hamilton_dag(workflow: Workflow, output_path: str) -> Any:
     """Convert a workflow into a Hamilton flow."""
     task_functions = load_tasks_module(workflow)
-    return driver.Builder().with_modules(task_functions).with_cache().build()
+    return (
+        driver.Builder()
+        .with_modules(task_functions)
+        .with_cache(Path(output_path) / ".hamilton_cache")
+        .build()
+    )
 
 
 # def gitlab_ci_workflow(workflow: Workflow):