Derive probed record types from the working zone

Stop blindly probing a fixed list (which always included CAA): read the
auto-filled zone and only probe the RR types each owner actually has,
keeping SOA/NS at the apex. The recordTypes option still works as an
explicit override; missing zone falls back to the legacy default.

checker/definition.go

@@ -32,8 +32,7 @@ func (p *resolverPropagationProvider) Definition() *sdk.CheckerDefinition {
 					Id:          "recordTypes",
 					Type:        "string",
 					Label:       "Record types to probe",
-					Description: "Comma-separated list of RR types. The checker probes every listed type at the zone apex (and at each 'subdomains' entry).",
-					Default:     "SOA,NS,A,AAAA,MX,TXT,CAA",
+					Description: "Comma-separated list of RR types to probe at every owner (apex + each 'subdomains' entry). Leave empty to derive the list from the working zone (SOA/NS at the apex plus whatever RR types are actually defined on each owner).",
 				},
 				{
 					Id:          "subdomains",
@@ -92,6 +91,12 @@ func (p *resolverPropagationProvider) Definition() *sdk.CheckerDefinition {
 					Label:    "Zone name",
 					AutoFill: sdk.AutoFillDomainName,
 				},
+				{
+					Id:       "zone",
+					Label:    "Zone",
+					AutoFill: sdk.AutoFillZone,
+					Hide:     true,
+				},
 			},
 			ServiceOpts: []sdk.CheckerOptionDocumentation{
 				{