feat: bootstrap design kit and vaporwave demo baseline

CHANGELOG.md

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+# Changelog
+
+All notable changes to the public design kit surface are documented here.
+
+## Unreleased
+
+### Added
+
+- Submodule-first repository layout (`kit/`, `exports/`, `tools/designsync`, `demo/`)
+- Initial bundle manifests (`ai-rules`, `bible-core`, `go-web-skeleton`, `ui-pattern-table`, `ui-pattern-modal`)
+- `designsync` MVP CLI (`list`, `validate`, `plan`, `apply`)
+- Demo app (`demo/`) with bundle catalog UI
+