simutil_core 1.0.0

Core models and process execution for SimUtil.

Changelog

1.0.0

• Initial release, extracted from the simutil app.
• CommandExec() runs commands in-process; CommandExec.isolate(runner) runs them on an IsolateRunner background isolate.
• CommandExec() kills the process when timeout elapses.
• CommandExec() and IsolateRunner close the child's stdin, so commands that read stdin see EOF instead of hanging.