checker: split monolithic rule into per-concern rules

checker/rules_nameserver.go

@@ -0,0 +1,13 @@
+package checker
+
+import sdk "git.happydns.org/checker-sdk-go/checker"
+
+// nameserverRule covers Zonemaster's nameserver test module (server
+// behaviour, EDNS posture, unknown RR handling).
+func nameserverRule() sdk.CheckRule {
+	return &categoryRule{
+		name:        "zonemaster.nameserver",
+		description: "Zonemaster nameserver tests (server behaviour, EDNS, unknown RR handling).",
+		modules:     []string{"nameserver"},
+	}
+}