Summary

• Fixes RecursionError with Self-Referential Models in CliApp #781
• When using CliApp.run() with a model containing a self-referential field (e.g., foo: Optional["Foo"]), the CLI argument parser entered infinite recursion between _add_parser_args and _add_parser_submodels
• Added a model_path parameter that tracks ancestor models in the current recursion chain. Before expanding a submodel into CLI flags, it checks whether the model is already being processed — if so, it skips the expansion to break the cycle
• Self-referential fields can still be set via JSON (e.g., --foo '{"foo": {"foo": null}}'), only the infinite CLI flag expansion is prevented

Test plan

• Added test_cli_self_referential_model covering nested JSON values for self-referential models
• All 164 CLI tests pass
• Full test suite passes (361 passed, 56 skipped, 1 pre-existing unrelated failure)

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