feat(14.2.1-05): cover mlmarkdown, child adopt, and regen admin artifacts

MLMarkdownField and relation-child forms share the enabled-locale
inject and adopt merge; OpenAPI, types, docs, and boardwalk dist match.

Co-authored-by: Cursor <cursoragent@cursor.com>

admin/openapi/admin.json

@@ -913,6 +913,12 @@
             },
             "cabana.FormMeta": {
                 "properties": {
+                    "enabledLocales": {
+                        "items": {
+                            "type": "string"
+                        },
+                        "type": "array"
+                    },
                     "locale": {
                         "type": "string"
                     }