general: removal of AppStoreDetector, just use build flags

GazeTests/Services/AppStoreDetectorTests.swift

@@ -1,29 +0,0 @@
-//
-//  AppStoreDetectorTests.swift
-//  GazeTests
-//
-//  Created by Mike Freno on 1/10/26.
-//
-
-@testable import Gaze
-import Testing
-
-struct AppStoreDetectorTests {
-
-    @Test func isAppStoreVersionReturnsFalseInDebug() async {
-        // In test/debug builds, should always return false
-        #expect(await AppStoreDetector.isAppStoreVersion() == false)
-    }
-
-    @Test func isTestFlightReturnsFalseInDebug() async {
-        // In test/debug builds, should always return false
-        #expect(await AppStoreDetector.isTestFlight() == false)
-    }
-
-    @Test func receiptValidationHandlesMissingReceipt() async {
-        // When there's no receipt (development build), should return false
-        // This is implicitly tested by isAppStoreVersionReturnsFalseInDebug
-        // but we're documenting the expected behavior
-        #expect(await AppStoreDetector.isAppStoreVersion() == false)
-    }
-}