wboayue / rust-ibapi / 26347448912

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contracts: decode_option_computation proto-only at floor 210 (#630)

TickOptionComputation (msg 21) gates at PROTOBUF_MARKET_DATA (206), below floor 210. The text decoder in contracts is replaced by a narrow re-export of realtime decode_tick_option_computation (same proto, same OptionComputation struct). Deletes next_optional_double helper, drops the server_version arg from the OptionComputation StreamDecoder. Adds TickOptionComputationResponse builder in src/testdata/builders/market_data.rs (decoder-locality precedent). Migrates 3 fixture groups in src/contracts/common/test_tables.rs (option_calculation_test_cases, client_method_test_cases, stream_decoder_test_cases) from text to proto. Per-domain count contracts 1/4/0 -> 0/4/0; the unreachable list now only contains decode_tick_news (covered by sibling PR).

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