refactor: rename app from Severed to OpenAppLock

Full rename ahead of App Store submission: project, targets, bundle
identifiers (dev.bchen.Severed -> dev.bchen.OpenAppLock), entitlements
file, app entry point, user-facing onboarding strings, test helpers,
and docs. Verified: all 62 unit tests pass.

Co-Authored-By: Claude <noreply@anthropic.com>

OpenAppLockUITests/OnboardingUITests.swift

@@ -0,0 +1,31 @@
+//
+//  OnboardingUITests.swift
+//  OpenAppLockUITests
+//
+
+import XCTest
+
+final class OnboardingUITests: XCTestCase {
+    override func setUpWithError() throws {
+        continueAfterFailure = false
+    }
+
+    func testOnboardingWalksThroughPermissionToHome() throws {
+        let app = XCUIApplication.launchOpenAppLock(onboardingCompleted: false)
+
+        // Welcome step.
+        app.staticTexts["OpenAppLock"].waitToAppear()
+        app.buttons["onboardingContinueButton"].waitToAppear().tap()
+
+        // Permission step: granting (mocked) lands on the Apps home screen.
+        app.buttons["allowScreenTimeButton"].waitToAppear().tap()
+        app.buttons["newRuleButton"].waitToAppear()
+        XCTAssertTrue(app.staticTexts["Blocked Apps"].exists)
+    }
+
+    func testCompletedOnboardingIsSkipped() throws {
+        let app = XCUIApplication.launchOpenAppLock(onboardingCompleted: true)
+        app.buttons["newRuleButton"].waitToAppear()
+        XCTAssertFalse(app.buttons["onboardingContinueButton"].exists)
+    }
+}