Module compositions 

Generators for oneOf / allOf / anyOf schema compositions.

• oneOf → Rust enum. Tagged via #[serde(tag = "...")] when the schema carries a discriminator; otherwise #[serde(untagged)].
• anyOf → Rust enum, always #[serde(untagged)] (oneOf semantics without the exclusivity guarantee is rarely useful in typed Rust).
• allOf → Rust struct that merges its branches: $ref branches become #[serde(flatten)] fields; inline object branches inline their properties directly.

SchemaKind::Not and SchemaKind::Any remain unsupported and continue to fall back to serde_json::Value in super::types.

Inline (non-top-level) compositions are synthesized into top-level types using a deterministic name derived from the enclosing context (object name + property, operation id + role). The accumulated definitions are emitted alongside the explicit components/schemas items so all generated types live at module scope.

Functions

generate_all_of

Generate a Rust struct type for an allOf composition.

generate_any_of

Generate a Rust enum type for an anyOf composition.

generate_one_of

Generate a Rust enum type for a oneOf composition.