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* refactor(background-agent): optimize cache timer lifecycle and result handling Ultraworked with Sisyphus Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai> * refactor(background-task): simplify tool implementation and expand test coverage Ultraworked with Sisyphus Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai> * fix(background-task): fix BackgroundCancel tool parameter handling Correct parameter names and types in BackgroundCancel tool to match actual usage patterns. Add comprehensive test coverage for parameter validation. --------- Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>