Initial DOS VM tooling setup

2026-08-16 06:12:59 +09:00
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+# TODO
+
+- [x] Add a non-reboot abort path for a hung DOS command: inject `Ctrl+C` through QEMU's monitor and wait for the serial agent to recover.
+- [x] Apply a configurable timeout to `dos_exec` and invoke the non-reboot abort path on timeout.
+- [x] Expose `dos_abort` for an immediate user-requested command interruption.