feat(acp): supervisor spawn / handshake / monitor / kill / onExit

internal/acp/supervisor_unix.go

@@ -0,0 +1,23 @@
+//go:build !windows
+
+package acp
+
+import (
+	"syscall"
+	"time"
+)
+
+// unixGracefulTerm 在 Unix 平台上先发 SIGTERM，等待 grace 时间内退出；
+// 否则 Process.Kill。done channel 由 monitorProcess 关闭。
+func (s *Supervisor) unixGracefulTerm(proc *Process, grace time.Duration) {
+	if proc.Cmd.Process == nil {
+		return
+	}
+	_ = proc.Cmd.Process.Signal(syscall.SIGTERM)
+	select {
+	case <-proc.done:
+		return
+	case <-time.After(grace):
+		_ = proc.Cmd.Process.Kill()
+	}
+}