Defined the RecordingService and the TranscribingService protocols in the Recording package tracker.

Packages/Features/Sources/Recording/RecordingService.swift

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+import Foundation
+
+/// A service that captures audio from a microphone for the Recording feature.
+///
+/// ``RecordingView`` attaches the service to its model at initialization, so the audio capture can be swapped without touching the feature's
+/// state machine — for example, with a real microphone backend in the app, or with a mock in unit tests.
+public protocol RecordingService: Sendable {
+
+    /// Starts a new audio recording from the microphone.
+    func start() async throws
+
+    /// Pauses the ongoing recording.
+    func pause() async throws
+
+    /// Resumes a paused recording.
+    func resume() async throws
+
+    /// Stops the recording.
+    ///
+    /// - Returns: The audio captured since the recording started.
+    func stop() async throws -> Data
+
+}
+
+// MARK: - Services
+
+/// The recording service used by default, which simulates the audio capture without touching a microphone.
+public struct SimulatedRecordingService: RecordingService {
+
+    // MARK: Initializers
+
+    /// Creates a simulated recording service.
+    public init() {}
+
+    // MARK: Methods
+
+    /// Simulates the start of an audio recording.
+    public func start() async throws {}
+
+    /// Simulates the pause of an ongoing recording.
+    public func pause() async throws {}
+
+    /// Simulates the resumption of a paused recording.
+    public func resume() async throws {}
+
+    /// Simulates the stop of a recording.
+    ///
+    /// - Returns: An empty audio payload.
+    public func stop() async throws -> Data {
+        .init()
+    }
+
+}

Packages/Features/Sources/Recording/TranscribingService.swift

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+import Foundation
+
+/// A service that transcribes recorded audio into text for the Recording feature.
+///
+/// ``RecordingView`` attaches the service to its model at initialization, so the transcription can be swapped without touching the feature's
+/// state machine — for example, with a real transcription backend in the app, or with a fast mock in unit tests.
+public protocol TranscribingService: Sendable {
+
+    /// Transcribes the given recorded audio into text.
+    ///
+    /// - Parameter audio: The recorded audio to transcribe.
+    /// - Returns: The transcription of the recorded audio.
+    func transcribe(_ audio: Data) async throws -> String
+
+}
+
+// MARK: - Services
+
+/// The transcribing service used by default, which simulates the transcription work.
+public struct SimulatedTranscribingService: TranscribingService {
+
+    // MARK: Initializers
+
+    /// Creates a simulated transcribing service.
+    public init() {}
+
+    // MARK: Methods
+
+    /// Simulates the transcription of the given recorded audio with a two-second delay.
+    ///
+    /// - Parameter audio: The recorded audio to transcribe.
+    /// - Returns: A dummy transcription.
+    public func transcribe(_ audio: Data) async throws -> String {
+        try await Task.sleep(for: Constant.Delay.transcribing)
+
+        return Constant.Text.transcription
+    }
+
+}
+
+// MARK: - Constants
+
+/// The constant values used across the transcribing services.
+private enum Constant {
+    /// The delay constants.
+    enum Delay {
+        /// The duration of the simulated transcription work.
+        static let transcribing: Duration = .seconds(2)
+    }
+
+    /// The text constants.
+    enum Text {
+        /// The dummy transcription of a recorded audio.
+        static let transcription = "This is a dummy transcription of the recorded audio."
+    }
+}