autonomy notify: enforce notify allowlist from config and add guard test

pkg/autonomy/engine_notify_allowlist_test.go

@@ -0,0 +1,21 @@
+package autonomy
+
+import "testing"
+
+func TestShouldNotify_RespectsNotifyAllowChats(t *testing.T) {
+	e := &Engine{opts: Options{
+		DefaultNotifyChannel:        "telegram",
+		DefaultNotifyChatID:         "chat-1",
+		NotifyAllowChats:            []string{"chat-2", "chat-3"},
+		NotifyCooldownSec:           1,
+		NotifySameReasonCooldownSec: 1,
+	}}
+	if e.shouldNotify("k1", "") {
+		t.Fatalf("expected notify to be blocked when chat not in allowlist")
+	}
+
+	e.opts.NotifyAllowChats = []string{"chat-1"}
+	if !e.shouldNotify("k2", "") {
+		t.Fatalf("expected notify to pass when chat in allowlist")
+	}
+}