Extends ContentRepository with optional cacheDir: cached packs in
<cacheDir>/seasons/*/pack.json merge with bundled ones (cached wins
for same id), corrupt/future-schema packs silently ignored, refresh()
fires ContentDownloader.sync() once per session. main() wires the real
cache+downloader instance; default constructor stays bundled-only for tests.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
SaveRepository (versioned JSON over prefs) with best-result merging and
unlock walking; ContentRepository loads the bundled pack; SeasonFlow/
Progress notifiers orchestrate stage start -> win record -> advance.
Season map grid with stars/locks, Home -> Map -> Game navigation,
close button, next-stage action on the win overlay.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
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