Qualify recurring occurrence completion with portable graph transactions

test/fixtures/recurring-task/Task.qx

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+interface Task id "recurring:task-data" revision "recurring:task-data@1" {
+  queryable value occurrence id "recurring:occurrence" : uint64 {
+    get id "recurring:occurrence:get" execution snapshot targets [browser, server];
+  }
+  queryable value due id "recurring:due" : int64 {
+    get id "recurring:due:get" execution snapshot targets [browser, server];
+  }
+  queryable value title id "recurring:title" : string {
+    get id "recurring:title:get" execution snapshot targets [browser, server];
+    set id "recurring:title:set" execution transaction targets [browser, server];
+  }
+  operation complete id "recurring:complete" : uint64 -> unit {
+    call id "recurring:complete:call" execution transaction targets [browser, server];
+  }
+}

test/fixtures/recurring-task/TaskRuntime.qx

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+external atom TaskObject id "recurring:task";
+package TaskRuntime id "recurring:runtime" revision "recurring:runtime@1" {
+  operation complete id "recurring:runtime:complete" : uint64 -> unit
+  mode call execution transaction targets [browser, server] receiver atom TaskObject requires {
+    state occurrence id "recurring:port:occurrence" : uint64 [read, write];
+    state due id "recurring:port:due" : int64 [read, write];
+  };
+}

test/fixtures/recurring-task/workspace.qx

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+workspace RecurringTask id "workspace:recurring" revision "workspace:recurring@1" commit "aaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaaa" {
+  import interface Task;
+  import package TaskRuntime;
+  atom TaskObject id "recurring:task";
+  conform TaskObject as Task id "recurring:task:owner" {
+    private state Occurrence id "recurring:state:occurrence" on TaskObject : uint64 policy register default 0;
+    private state Due id "recurring:state:due" on TaskObject : int64 policy register;
+    private state Title id "recurring:state:title" on TaskObject : string policy register;
+    initialize { due to state Due; title to state Title; };
+    bind occurrence.get to state Occurrence.read;
+    bind due.get to state Due.read;
+    bind title.get to state Title.read;
+    bind title.set to state Title.write;
+    bind complete.call to package TaskRuntime.complete with {
+      occurrence to state Occurrence;
+      due to state Due;
+    };
+  }
+}