refactor: decompose TranscriptionEngine god object into focused managers#6

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Newarr wants to merge 10 commits intorefactor/logging-migration-stackedfrom

refactor/transcription-engine-decomposition

Commits on Mar 29, 2026

refactor: extract ModelDownloadManager, DeviceRoutingManager, TranscriptionStreamCoordinator
Szymon Sypniewicz
committed
fix: address critical compilation and memory leak issues from code review
Szymon Sypniewicz
committed
fix: track and cancel diarization task properly
Szymon Sypniewicz
committed
refactor: convert DeviceRoutingManager callbacks to async
Szymon Sypniewicz
committed
refactor: add bounded buffering and error propagation to coordinator
Szymon Sypniewicz
committed
fix: recompute model availability at start of loadModel()
Szymon Sypniewicz
committed
cleanup: remove duplicate DownloadProgressDetail definition
Szymon Sypniewicz
committed
fix: Swift 6 concurrency safety in TranscriptionStreamCoordinator
Szymon Sypniewicz
committed
refactor: integrate new managers into TranscriptionEngine
Szymon Sypniewicz
committed
fix: resolve 10 review bugs and 3 Swift 6 concurrency errors
Szymon Sypniewicz
committed