Emit unescaped JSON key for type fields

[leighmcculloch]

What

Fields named type now serialize to JSON as type instead of the keyword-escaped type_.

Why

SEP-51 says a field's JSON key is its snake_case name with no keyword escaping, so type must serialize as type. Since type is a Rust keyword the generator escaped it to type_, which leaked into the JSON and schemas.

Close #558

Known limitations

This is a breaking change to the generated JSON: output is now type, not type_. Decoding is preserved — type_ still deserializes via an alias.

[Copilot]

Pull request overview

Updates generated Rust types and JSON schemas so XDR type fields serialize per SEP-51 while retaining legacy deserialization support.

Changes:

• Adds generated Serde/Schemars field renames from type_ to type.
• Preserves type_ as a deserialization alias.
• Regenerates affected Rust types and JSON schemas with tests.

Reviewed changes

Copilot reviewed 37 out of 44 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
xdr-generator-rust/generator/src/naming.rs	Detects keyword-escaped JSON fields.
xdr-generator-rust/generator/src/generator.rs	Propagates JSON rename metadata.
xdr-generator-rust/generator/src/output.rs	Adds field rename metadata.
xdr-generator-rust/generator/src/tests/naming.rs	Tests rename detection.
xdr-generator-rust/generator/templates/struct.rs.jinja	Emits Serde aliases and schema renames.
tests/serde.rs	Tests current and legacy JSON keys.
src/generated/contract_event.rs	Regenerates ContractEvent.
src/generated/dont_have.rs	Regenerates DontHave.
src/generated/sc_spec_event_param_v0.rs	Regenerates event parameters.
src/generated/sc_spec_function_input_v0.rs	Regenerates function inputs.
src/generated/sc_spec_udt_struct_field_v0.rs	Regenerates struct fields.
src/generated/sc_spec_udt_union_case_tuple_v0.rs	Regenerates union tuple cases.
src/generated/serialized_binary_fuse_filter.rs	Regenerates binary fuse filters.
xdr-json/AuthenticatedMessage.json	Updates embedded schema key.
xdr-json/AuthenticatedMessageV0.json	Updates embedded schema key.
xdr-json/ContractEvent.json	Updates schema key.
xdr-json/DiagnosticEvent.json	Updates embedded schema key.
xdr-json/DontHave.json	Updates schema key.
xdr-json/InvokeHostFunctionSuccessPreImage.json	Updates embedded schema key.
xdr-json/LedgerCloseMeta.json	Updates embedded schema key.
xdr-json/LedgerCloseMetaBatch.json	Updates embedded schema key.
xdr-json/LedgerCloseMetaV0.json	Updates embedded schema key.
xdr-json/LedgerCloseMetaV1.json	Updates embedded schema key.
xdr-json/LedgerCloseMetaV2.json	Updates embedded schema key.
xdr-json/OperationMetaV2.json	Updates embedded schema key.
xdr-json/ScSpecEntry.json	Updates embedded schema keys.
xdr-json/ScSpecEventParamV0.json	Updates schema key.
xdr-json/ScSpecEventV0.json	Updates embedded schema key.
xdr-json/ScSpecFunctionInputV0.json	Updates schema key.
xdr-json/ScSpecFunctionV0.json	Updates embedded schema key.
xdr-json/ScSpecUdtStructFieldV0.json	Updates schema key.
xdr-json/ScSpecUdtStructV0.json	Updates embedded schema key.
xdr-json/ScSpecUdtUnionCaseTupleV0.json	Updates schema key.
xdr-json/ScSpecUdtUnionCaseV0.json	Updates embedded schema key.
xdr-json/ScSpecUdtUnionV0.json	Updates embedded schema key.
xdr-json/SerializedBinaryFuseFilter.json	Updates schema key.
xdr-json/SorobanTransactionMeta.json	Updates embedded schema key.
xdr-json/StellarMessage.json	Updates embedded schema key.
xdr-json/TransactionEvent.json	Updates embedded schema key.
xdr-json/TransactionMeta.json	Updates embedded schema key.
xdr-json/TransactionMetaV3.json	Updates embedded schema key.
xdr-json/TransactionMetaV4.json	Updates embedded schema key.
xdr-json/TransactionResultMeta.json	Updates embedded schema key.
xdr-json/TransactionResultMetaV1.json	Updates embedded schema key.

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