fix: complete P2 host workspace contract

tools/thothctl/internal/compose/process_windows.go

@@ -1,5 +1,51 @@
 //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() } }
+
+import (
+	"golang.org/x/sys/windows"
+	"os/exec"
+	"sync"
+)
+
+var ownedJobs = struct {
+	sync.Mutex
+	m map[*exec.Cmd]windows.Handle
+}{m: make(map[*exec.Cmd]windows.Handle)}
+
+func configureOwnedProcess(c *exec.Cmd) {
+	c.SysProcAttr = &windows.SysProcAttr{CreationFlags: windows.CREATE_NEW_PROCESS_GROUP}
+}
+func registerOwnedProcess(c *exec.Cmd) error {
+	h, err := windows.CreateJobObject(nil, nil)
+	if err != nil {
+		return err
+	}
+	if err = windows.AssignProcessToJobObject(h, windows.Handle(c.Process.Pid)); err != nil {
+		windows.CloseHandle(h)
+		return err
+	}
+	ownedJobs.Lock()
+	ownedJobs.m[c] = h
+	ownedJobs.Unlock()
+	return nil
+}
+func releaseOwnedProcess(c *exec.Cmd) {
+	ownedJobs.Lock()
+	h := ownedJobs.m[c]
+	delete(ownedJobs.m, c)
+	ownedJobs.Unlock()
+	if h != 0 {
+		windows.CloseHandle(h)
+	}
+}
+func terminateOwnedProcess(c *exec.Cmd) {
+	ownedJobs.Lock()
+	h := ownedJobs.m[c]
+	ownedJobs.Unlock()
+	if h != 0 {
+		_ = windows.TerminateJobObject(h, 1)
+	} else if c.Process != nil {
+		_ = c.Process.Kill()
+	}
+}