…3359) ## Why? - Add first-class Swift support so Swift applications can use Fory xlang serialization. - Bring Swift into Fory’s cross-language test/CI matrix and close the related Swift tracking issues. ## What does this PR do? - Bootstraps a new `swift/` package with a library target (`ForySwift`), macro target (`ForySwiftMacros`), and xlang peer executable (`ForySwiftXlangPeer`). - Implements the Swift serialization runtime: byte buffer IO, primitive/optional/collection/map serializers, reference resolver/context, type IDs/flags, type metadata, and error handling. - Adds supporting components such as metastring encoding/decoding and MurmurHash3 used by metadata/protocol paths. - Adds `@ForyObject` macro generation for Swift structs/classes. - Adds the Swift xlang peer executable used by Java xlang compatibility tests. - Adds broad Swift unit tests for primitive/optional/collection round trips, reference tracking, macro models, varint edge cases, metastring, and type metadata behavior. - Adds Java integration test `SwiftXlangTest` and CI jobs (`swift`, `swift_xlang`) on macOS. - Updates repo housekeeping for Swift builds (`swift/.build` in `.gitignore`) and adds `swift/README.md`. ## Related issues Closes apache#3351 Closes apache#3350 Closes apache#3324 Closes apache#3352 Closes apache#3353 Closes apache#3354 apache#1017 apache#3349 ## Does this PR introduce any user-facing change? Adds a new Swift SDK/package (`swift/`) with serialization APIs and macro-based object support. - [x] Does this PR introduce any public API change? - [ ] Does this PR introduce any binary protocol compatibility change? ## Benchmark N/A for initial Swift implementation.

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[Swift] Core serialization interface and infrastructure for Fory Swift #3350

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