chore: establish Ekklesia platform foundation

tests/fixtures/boundaries/module-has-ui/modules/calendar/src/calendar.css

@@ -0,0 +1,3 @@
+.calendar {
+  display: grid;
+}

tests/fixtures/boundaries/module-has-ui/modules/calendar/src/calendar.tsx

@@ -0,0 +1,3 @@
+export function Calendar(): string {
+  return "calendar";
+}