[release/v1.2] [DEV-1654] Support V2 projection engine on createProjection#504
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w1am merged 3 commits intorelease/v1.2from May 6, 2026
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Adds ProjectionEngineVersion enum and engineVersion option to createProjection, plumbed through both gRPC (CreateReq.Options.engine_version) and the HTTP fallback (engineversion query param).
Switch the public enum to string values (V1="v1", V2="v2") and map to the int32 wire format at the gRPC/HTTP boundary. Resolve option defaults once at the entry instead of duplicating them in each helper.
Replace the local TypeScript enum with constants in src/constants.ts (PROJECTION_ENGINE_V1 / PROJECTION_ENGINE_V2) plus a union type in src/types, matching the pattern used by NodePreference, ConsumerStrategy, and other public string-valued enums.
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Cherry picked from #502