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/tests/unit/test_version.gd

@@ -0,0 +1,13 @@
+extends "res://addons/gut/test.gd"
+
+
+func test_string_matches_project_setting():
+	var expected := str(ProjectSettings.get_setting("application/config/version", ""))
+	assert_ne(expected, "", "project.godot must carry application/config/version (run scripts/sync-version)")
+	assert_eq(Version.new().string(), expected)
+
+
+func test_footer_contains_version_and_engine():
+	var v := Version.new()
+	assert_string_contains(v.footer(), v.string())
+	assert_string_contains(v.footer(), "BUILT IN GODOT 4.7")