Add App Store screenshot harness + listing metadata

DEBUG-only screenshot support (seeded sample data via ScreenshotSeed, per-screen
launch args, screenshot roots for both apps) so iPhone + Apple Watch App Store
shots can be captured deterministically from the simulator — all excluded from
release builds. Also seed ExerciseView's set-grid progress in init so it renders
correctly on the first frame. Adds Scripts/metadata/ as the listing source of
truth (copy, URLs, review notes, and the captured screenshots).

Claude-Session: https://claude.ai/code/session_018gg69MaUetDNzWzBXisfMV

Workouts Watch App/Views/ExerciseProgressView.swift

@@ -35,17 +35,22 @@ struct ExerciseProgressView: View {
     @State private var showingCancelConfirm = false
     @State private var didRestorePage = false
 
-    init(doc: Binding<WorkoutDocument>, logID: String, onChange: @escaping () -> Void) {
+    /// Forces the starting page (used only by the DEBUG screenshot host to land on a
+    /// rest page). Always nil in normal use.
+    private let debugInitialPage: Int?
+
+    init(doc: Binding<WorkoutDocument>, logID: String, onChange: @escaping () -> Void, debugInitialPage: Int? = nil) {
         self._doc = doc
         self.logID = logID
         self.onChange = onChange
+        self.debugInitialPage = debugInitialPage
 
         let log = doc.wrappedValue.logs.first { $0.id == logID }
         let sets = max(1, log?.sets ?? 1)
         _setCount = State(initialValue: sets)
         // Resume on the first unfinished set's work page (clamped to the last set).
         let completed = min(max(0, log?.currentStateIndex ?? 0), sets - 1)
-        _currentPage = State(initialValue: completed * 2)
+        _currentPage = State(initialValue: debugInitialPage ?? (completed * 2))
     }
 
     private var log: WorkoutLogDocument? {
@@ -96,11 +101,14 @@ struct ExerciseProgressView: View {
         }
         .onAppear {
             // Jump to the first unfinished set. A paged TabView can settle on page 0 on
-            // first layout, so re-assert once more after this run loop.
+            // first layout, so re-assert once more after this run loop. (The screenshot
+            // host pins an explicit page, so skip the resume jump there.)
             guard !didRestorePage else { return }
             didRestorePage = true
-            jumpToResumePage()
-            Task { @MainActor in jumpToResumePage() }
+            if debugInitialPage == nil {
+                jumpToResumePage()
+                Task { @MainActor in jumpToResumePage() }
+            }
         }
     }