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

Scripts/metadata/version/review.json

@@ -0,0 +1,8 @@
+{
+  "contactFirstName": "Rouslan",
+  "contactLastName": "Zenetl",
+  "contactPhone": "+16465840598",
+  "contactEmail": "rzenetl@gmail.com",
+  "demoAccountRequired": false,
+  "notes": "Workouts Plus stores its data as JSON files in the reviewer's own iCloud Drive, so please sign into iCloud with iCloud Drive enabled before testing — without iCloud the app shows a blocking \"iCloud Required\" screen. To try it: open the iPhone app, tap \"Add Starter Splits\" in Settings (or create a split), then start a workout from a split. Starting a workout launches the paired Apple Watch app into the session via HealthKit (allow the Health prompt), so please review on a paired Apple Watch. On the watch, tap an exercise and swipe through the work/rest pages; completing a set syncs back to the iPhone in real time. The HealthKit permission is used only to launch and run the on-watch workout session — the app does not read your health data."
+}