wboayue / rust-ibapi / 24279427661

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add inbound protobuf decoders (Phase 3) (#450)

* add inbound protobuf decoders (Phase 3)

Shared converters in proto/decoders.rs for Contract, Order, OrderState,
Execution, ContractDetails, and other reusable types. Domain-specific
decoders in each module decoders.rs with _proto suffix. Unit tests
construct protobuf bytes with prost and verify decoded domain structs.

* change perm_id from i32 to i64, standardize proto decoder imports and error messages

* add Error::ProtobufDecode variant, remove map_err boilerplate

* document protobuf decoder module structure in CLAUDE.md

* deduplicate proto decoder helpers, extract tag_values converter

* use shared helpers optional_f64/parse_f64 in order proto decoders

* add tests for all remaining proto decoders (20 new tests)

* add test coverage requirement to CLAUDE.md

* collapse contracts decoders/ directory back to single decoders.rs

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