general: cleanup for manual var tuning

Gaze/Constants/EyeTrackingConstants.swift

@@ -0,0 +1,44 @@
+//
+//  EyeTrackingConstants.swift
+//  Gaze
+//
+//  Created by Mike Freno on 1/14/26.
+//
+
+import Foundation
+
+enum EyeTrackingConstants {
+    // MARK: - Logging
+    /// Interval between log messages in seconds
+    static let logInterval: TimeInterval = 0.5
+    
+    // MARK: - Eye Closure Detection
+    /// Threshold for eye closure (smaller value means eye must be more closed to trigger)
+    /// Range: 0.0 to 1.0 (approximate eye opening ratio)
+    static let eyeClosedThreshold: CGFloat = 0.02
+    
+    // MARK: - Face Pose Thresholds
+    /// Maximum yaw (left/right head turn) in radians before considering user looking away
+    /// 0.20 radians ≈ 11.5 degrees (Tightened from 0.35)
+    static let yawThreshold: Double = 0.20
+    
+    /// Pitch threshold for looking UP (above screen).
+    /// Since camera is at top, looking at screen is negative pitch.
+    /// Values > 0.1 imply looking straight ahead or up (away from screen).
+    static let pitchUpThreshold: Double = 0.1
+    
+    /// Pitch threshold for looking DOWN (at keyboard/lap).
+    /// Values < -0.45 imply looking too far down.
+    static let pitchDownThreshold: Double = -0.45
+    
+    // MARK: - Pupil Tracking Thresholds
+    /// Minimum horizontal pupil ratio (0.0 = right edge, 1.0 = left edge)
+    /// Values below this are considered looking right (camera view)
+    /// Tightened from 0.25 to 0.35
+    static let minPupilRatio: Double = 0.35
+    
+    /// Maximum horizontal pupil ratio
+    /// Values above this are considered looking left (camera view)
+    /// Tightened from 0.75 to 0.65
+    static let maxPupilRatio: Double = 0.65
+}