- Added interactive shell console subcommand to coding-agent CLI with support for working directory, timeout, and snapshot configuration.
- Added cancellation token support to ExecutionContext and ExecutionParameters for graceful shell execution interruption.
- Implemented cancellation checks throughout AST execution pipeline (Program, CompoundList, AndOrList, Pipeline, and all command types) to enable responsive interruption.
- Replaced process tracking mechanism with tokio_util CancellationToken for improved async cancellation handling.
- Added tokio-util 0.7.16 dependency to pi-natives crate for cancellation token support.
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