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/scripts/util/version.gd

@@ -0,0 +1,18 @@
+class_name Version
+extends RefCounted
+## The client's view of the single source of truth (/VERSION, charter §4). The
+## value is baked into project.godot's application/config/version by
+## scripts/sync-version on each bump; read it via ProjectSettings so an exported
+## build (which has no repo-root /VERSION) still knows its own version.
+
+const SETTING := "application/config/version"
+const LAST_RESORT := "0.0.0-dev"
+
+
+func string() -> String:
+	var v := str(ProjectSettings.get_setting(SETTING, ""))
+	return v if v != "" else LAST_RESORT
+
+
+func footer() -> String:
+	return "v%s · BUILT IN GODOT 4.7 · © 2026" % string()