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* fix(subagents): cleanup background tasks after completion to prevent memory leak Added cleanup_background_task() function to remove completed subagent results from the global _background_tasks dict. Found a small issue: completed tasks were never removed, causing memory to grow indefinitely with each subagent execution. Alternative approaches considered: - Future + SubagentHandle pattern: Not chosen due to requiring refactoring Chose the simple cleanup approach for minimal code changes while effectively resolving the memory leak. Changes: - Add cleanup_background_task() in executor.py - Call cleanup in all task_tool return paths (completed, failed, timed out) * fix(subagents): prevent race condition in background task cleanup Address Copilot review feedback on memory leak fix: - Add terminal state check in cleanup_background_task() to only remove tasks that are COMPLETED/FAILED/TIMED_OUT or have completed_at set - Remove cleanup call from polling safety-timeout branch in task_tool since the task may still be running - Add comprehensive tests for cleanup behavior including: - Verification that cleanup is called on terminal states - Verification that cleanup is NOT called on polling timeout - Tests for terminal state check logic in executor This prevents KeyError when the background executor tries to update a task that was prematurely removed from _background_tasks. --------- Co-authored-by: Willem Jiang <willem.jiang@gmail.com>