feat: define P2 host workspace command contract

tools/thothctl/internal/compose/process_windows.go

@@ -0,0 +1,5 @@
+//go:build windows
+package compose
+import ("os/exec"; "syscall")
+func configureOwnedProcess(c *exec.Cmd) { c.SysProcAttr=&syscall.SysProcAttr{} }
+func terminateOwnedProcess(c *exec.Cmd) { if c.Process!=nil { _=c.Process.Kill() } }