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()
+    }
+
+}