v0.1.3 of restage_a2ui

Fail-closed pre-render capability checks and the Restage capability sidecar for apps rendering cached A2UI (Google genui) surfaces. Changelog excerpt: - Update the catalog walkthrough to drop the removed build_runner --delete-conflicting-outputsflag. - Regenerate the bundled example catalog so its standalone A2UI document carries each component's full data schema (see restage_codegen1.0.4). This package is unchanged at runtime.