Fix state mutation in task_results handling

[Copilot]

Addresses state mutation issue where task_results dictionary was retrieved from state and modified in-place, violating immutability requirements for LangGraph state management.

Changes

Changed from mutating pattern:

task_results = state.get("task_results", {})
task_results[current_task_id] = {...}

To immutable pattern:

task_results = dict(state.get("task_results", {}))
task_results[current_task_id] = {...}

Files modified:

• agents/multi_step_processing.py (4 instances)
  • Line 601: execute_node_multi success case
  • Line 627: execute_node_multi error case
  • Line 957: execute_llm_task_node success case
  • Line 980: execute_llm_task_node error case

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