feat(client): Version helper + sync-version script; project.godot config/version

- Add scripts/sync-version to sync root /VERSION into client/project.godot
- Add Version GDScript helper (reads application/config/version)
- Test coverage: 2 tests for Version.string() and footer()
- Synced config/version="0.01-alpha" to project.godot

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

client/project.godot

@@ -11,6 +11,7 @@ config_version=5
 [application]
 
 config/name="coc-rpg"
+config/version="0.01-alpha"
 config/description="AI-driven single-player party RPG. Code owns state. AI owns text."
 config/features=PackedStringArray("4.7")