Initial commit: Core packages

odoo-bringout-oca-ocb-mail_group/doc/MODELS.md

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+# Models
+
+Detected core models and extensions in mail_group.
+
+```mermaid
+classDiagram
+    class mail_group
+    class mail_group_member
+    class mail_group_message
+    class mail_group_moderation
+```
+
+Notes
+- Classes show model technical names; fields omitted for brevity.
+- Items listed under _inherit are extensions of existing models.