Add Sendable conformance to public structs

[naykutguven]

This pull request adds the Sendable protocol conformance to a number of core data structures throughout the WhisperKit codebase. This update improves the safety and correctness of concurrent code by ensuring these types can be safely passed across threads, which is particularly important for Swift Concurrency. No other functional changes are introduced.

Concurrency and thread safety improvements:

• Added Sendable conformance to key structs and enums related to audio processing, configuration, model support, and transcription, such as AudioDevice, AudioInputConfig, DecodingOptions, ModelComputeOptions, ModelSupport, DeviceSupport, ModelSupportConfig, AudioChunk, DecodingTask, DecodingFallback, TranscriptionResult, TranscriptionSegment, WordTiming, TranscriptionProgress, TranscriptionTimings, SpecialTokens, and SamplingResult.

[Copilot]

Pull Request Overview

This pull request adds Sendable protocol conformance to core data structures throughout the WhisperKit codebase to improve thread safety and support Swift Concurrency. The changes ensure these types can be safely passed across threads without introducing functional modifications.

Key changes:

• Added Sendable conformance to 15+ public structs and enums across audio processing, model configuration, and transcription components
• Enhanced concurrency safety for data structures used in multi-threaded audio processing workflows
• Maintained existing API compatibility while improving thread safety guarantees

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
Sources/WhisperKit/Core/Text/TokenSampler.swift	Added Sendable to SamplingResult struct
Sources/WhisperKit/Core/Models.swift	Added Sendable to 10 core data structures including model options, transcription results, and audio chunks
Sources/WhisperKit/Core/Configurations.swift	Added Sendable to DecodingOptions struct
Sources/WhisperKit/Core/Audio/AudioProcessor.swift	Added Sendable to audio-related structs and enums including AudioDevice, AudioInputConfig, and ChannelMode

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