fix: complete P2 host workspace contract

tools/thothctl/internal/compose/process_unix.go

@@ -1,5 +1,18 @@
 //go:build !windows
+
 package compose
-import ("os/exec"; "syscall")
-func configureOwnedProcess(c *exec.Cmd) { c.SysProcAttr=&syscall.SysProcAttr{Setpgid:true} }
-func terminateOwnedProcess(c *exec.Cmd) { if c.Process!=nil { _=syscall.Kill(-c.Process.Pid, syscall.SIGKILL); _=c.Process.Kill() } }
+
+import (
+	"os/exec"
+	"syscall"
+)
+
+func configureOwnedProcess(c *exec.Cmd)      { c.SysProcAttr = &syscall.SysProcAttr{Setpgid: true} }
+func registerOwnedProcess(c *exec.Cmd) error { return nil }
+func releaseOwnedProcess(c *exec.Cmd)        {}
+func terminateOwnedProcess(c *exec.Cmd) {
+	if c.Process != nil {
+		_ = syscall.Kill(-c.Process.Pid, syscall.SIGKILL)
+		_ = c.Process.Kill()
+	}
+}