feat(rust): implement true anyOf support with OR semantics#21915

Draft

timvw wants to merge 15 commits intoOpenAPITools:masterfrom

timvw:refactoring/rust-true-anyof-support

Commits on Sep 7, 2025

docs(rust): add OpenAPI spec links and cross-language comparison
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docs(rust): add comprehensive ambiguity handling documentation
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docs(rust): add spec compliance analysis for untagged enums
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docs: clarify complete allOf/anyOf/oneOf semantics
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Merge branch 'follow-up-rust-anyof-test' of github.com:OpenAPITools/openapi-generator into refactoring/rust-true-anyof-support
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feat: merge wing328's anyOf test samples and regenerate with true anyOf support

timvw
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docs: add informal findings about wing328's test case
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docs: add comprehensive Rust generator type mapping documentation
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docs: move Rust type mapping documentation to correct location
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docs: add composition-based alternative for allOf support
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docs: add cross-language comparison for oneOf/anyOf/allOf handling
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