Implement platform-specific process attribute settings for llama server

pkg/lifecycle.go

@@ -41,10 +41,7 @@ func (i *Instance) Start() error {
 	i.cmd = exec.CommandContext(i.ctx, "llama-server", args...)
 
 	if runtime.GOOS != "windows" {
-		if i.cmd.SysProcAttr == nil {
+		setProcAttrs(i.cmd)
-			i.cmd.SysProcAttr = &syscall.SysProcAttr{}
-		}
-		i.cmd.SysProcAttr.Setpgid = true
 	}
 
 	var err error

pkg/process_group_unix.go

@@ -0,0 +1,15 @@
+//go:build !windows
+
+package llamactl
+
+import (
+	"os/exec"
+	"syscall"
+)
+
+func setProcAttrs(cmd *exec.Cmd) {
+	if cmd.SysProcAttr == nil {
+		cmd.SysProcAttr = &syscall.SysProcAttr{}
+	}
+	cmd.SysProcAttr.Setpgid = true
+}

pkg/process_group_windows.go

@@ -0,0 +1,9 @@
+//go:build windows
+
+package llamactl
+
+import "os/exec"
+
+func setProcAttrs(cmd *exec.Cmd) {
+	// No-op on Windows
+}