Read stored manifests leniently and mark the defaults layer (hq ADR 0262 review)

A strict read of the stored catalogue fails every plan and send once a manifest uses a field an older
controller lacks; registration stays strict. A node named default lost its layer to the name check.
Judge the operator's keys by whole words, and scan a default under any key.

cmd/mesh-controller/modules.go

@@ -546,7 +546,7 @@ func describeEffective(module, where string, values []catalogue.SettingSource) s
 	for _, v := range values {
 		value, _ := json.Marshal(v.Value)
 		fmt.Fprintf(&b, "  %s = %s  (%s", v.Key, value, v.From)
-		if v.HasDefault && v.From != catalogue.DefaultLayer {
+		if v.HasDefault && !v.FromDefault {
 			d, _ := json.Marshal(v.Default)
 			fmt.Fprintf(&b, "; the default is %s", d)
 		}

cmd/mesh-controller/settings_effective_test.go

@@ -10,7 +10,7 @@ import (
 func TestSettingsSayWhereEachValueComesFrom(t *testing.T) {
 	got := describeEffective("dunst", "laptop", []catalogue.SettingSource{
 		{Key: "font-size", Value: float64(13), From: "laptop", Default: float64(10), HasDefault: true},
-		{Key: "width", Value: float64(250), From: catalogue.DefaultLayer, Default: float64(250), HasDefault: true},
+		{Key: "width", Value: float64(250), From: catalogue.DefaultLayer, FromDefault: true, Default: float64(250), HasDefault: true},
 	})
 	want := "dunst on laptop, every value and where it comes from:\n" +
 		"  font-size = 13  (laptop; the default is 10)\n" +