Native SDK: the complete toolkit for building native desktop apps (ve…

…rcel-labs#67)

zero-native becomes the Native SDK. Apps are authored as native markup plus Zig on a deterministic runtime and rendered by the toolkit's own engine into real OS windows — no browser, no WebView, no interpreter in the binary.

- Desktop is complete on macOS, Windows, and Linux: native rendering with per-platform titlebar fidelity, audio playback with streaming, a verified track cache, and real spectrum analysis, native context menus, packaging with sealed code signing, and a deterministic automation and record-replay story.
- Experimental iOS and Android host tiers ship behind the same app manifest: simulator and emulator dev loops, archive-ready packaging, real platform tab bars and push navigation, with embedding over the C ABI underneath.
- The docs site, component catalog, theme packs, showcase apps, and CHANGELOG carry the full account.

Merge pull request vercel-labs#63 from vercel-labs/ctate/v0.3.0

Prepare v0.3.0 release

Merge pull request vercel-labs#40 from vercel-labs/ctate/v0.2.0

Prepare 0.2.0 release

prepare v0.1.9 release

prepare v0.1.8 release

prepare v0.1.7 release

prepare v0.1.6 release

prepare v0.1.5 release

prepare v0.1.4 release

prepare v0.1.3 release