feat: concurrent task execution with DAG scheduler#288

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03-20-feat_concurreny

Commits on Mar 23, 2026

feat: add `CancellationToken` support for `spawn_inherited` and `spawn_with_tracking`

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feat: concurrent task execution with DAG scheduler

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fix: clippy collapsible_if and Windows barrier hang

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fix: kill process tree on Windows via Job Object

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fix: Windows compilation errors in win_job module

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refactor: use raw_handle() instead of OpenProcess via PID

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fix: apply Job Object to all spawn paths and add fspy kill test

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fix: terminate job on cancellation to unblock pipe reads

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fix: pipe read loop hangs on Windows due to pending cancelled() arm

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refactor: simplify spawn_with_tracking cancellation flow

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fix: handle tasks that close stdio without exiting

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