[Bug Fix] Handling of Automatic Type Registration

[pbhal]

Deep type registration

1. ReSettings.AutoRegisterInputType now auto‐discovers generic, array, and nullable element types (e.g. List<List>, T?[]).
2. All base classes and interfaces (e.g. IEnumerable) are included automatically.

Improved JSON/JToken handling

1. No longer need to manually add JObject/JToken/JArray to CustomTypes. Rules using input["foo"][0]["bar"] compile and run out of the box.

2. Use Convert.ToString(...) (instead of .ToString()) on JTokens to avoid “Enumerable.ToString” conflicts.

Nullable comparisons fixed

1. Expressions like decimal? d < 20 now return false instead of throwing.

Defaults tweaked

1. UseFastExpressionCompiler defaults to false when custom types are present; re‐enable explicitly if needed.

Unit test coverage

1. New tests cover nested JSON rules, custom‐type provider edge cases, and nullable comparison.

[pbhal]

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[pbhal]

#667