Re-enable Credo ModuleDoc check

Closes #108

.credo.exs

@@ -4,11 +4,34 @@
       name: "default",
       checks: %{
         extra: [
-          {Credo.Check.Refactor.Nesting, max_nesting: 3}
+          {Credo.Check.Refactor.Nesting, max_nesting: 3},
+          {Credo.Check.Readability.ModuleDoc,
+           ignore_names: [
+             # Credo defaults
+             ~r/(\.\w+Controller|\.Endpoint|\.\w+Live(\.\w+)?|\.Repo|\.Router|\.\w+Socket|\.\w+View|\.\w+HTML|\.\w+JSON|\.Telemetry|\.Layouts|\.Mailer)$/,
+             # Custom: external API internals follow a three-module pattern
+             # where only the facade needs documentation
+             ~r/\.API(\..*)?$/,
+             ~r/\.Config$/,
+             # Custom: test support modules
+             ~r/Fixtures/,
+             # Custom: mix tasks
+             ~r/^Mix\.Tasks\./
+           ],
+           ignore_modules_using: [
+             # Credo defaults
+             Credo.Check,
+             Ecto.Schema,
+             Phoenix.LiveView,
+             ~r/\.Web$/,
+             # Custom: LiveComponents and Oban workers are self-documenting
+             Oban.Worker,
+             # Matches `use MusicLibraryWeb, :live_component` etc.
+             MusicLibraryWeb
+           ]},
+          {Credo.Check.Refactor.CyclomaticComplexity, max_complexity: 12}
         ],
-        disabled: [
-          {Credo.Check.Readability.ModuleDoc, []}
-        ]
+        disabled: []
       }
       # files etc.
     }