Masked email: x:MaskedEmail/changes and a state in /get (fork additions)

The fork's per-account change log answers /changes, collapsing a mask
created and destroyed in the window. /changes on a registry type needs that
type's get permission.

crates/jmap-proto/src/references/eval.rs

@@ -128,6 +128,10 @@ impl Response<'_> {
                         ChangesResponseMethod::ShareNotification(response) => {
                             response.eval_jptr(path, &mut results)
                         }
+                        // inbuxa: x:MaskedEmail/changes
+                        ChangesResponseMethod::Registry(response) => {
+                            response.eval_jptr(path, &mut results)
+                        }
                     },
                     ResponseMethod::Query(response) => response.eval_jptr(path, &mut results),
                     ResponseMethod::QueryChanges(response) => {

crates/jmap-proto/src/request/method.rs

@@ -361,7 +361,12 @@ impl MethodName {
                 "get" => MethodFunction::Get,
                 "set" => MethodFunction::Set,
                 "query" => MethodFunction::Query,
+                "changes" => MethodFunction::Changes,
             )?;
+            // inbuxa: only masked email has /changes (a fork addition)
+            if fnc == MethodFunction::Changes && obj != ObjectType::MaskedEmail {
+                return None;
+            }
 
             if obj.flags() & OBJ_SINGLETON == 0 || fnc != MethodFunction::Query {
                 (MethodObject::Registry(obj), fnc).into()

crates/jmap-proto/src/response/mod.rs

@@ -137,6 +137,8 @@ pub enum ChangesResponseMethod {
     CalendarEvent(Box<ChangesResponse<CalendarEvent>>),
     CalendarEventNotification(Box<ChangesResponse<CalendarEventNotification>>),
     ShareNotification(Box<ChangesResponse<ShareNotification>>),
+    // inbuxa: x:MaskedEmail/changes
+    Registry(Box<ChangesResponse<crate::object::registry::Registry>>),
 }
 
 #[derive(Debug, serde::Serialize)]