Prerelease Alpha 45 — Terminal, fixed

The Terminal works again on Apple Silicon. Opening a Terminal tab had started failing instantly with posix_spawnp failed — the helper Rush uses to launch your shell was built against libraries the notarized app can't load. It's now built strictly against the system toolchain, and the release build refuses to ship if any bundled binary reaches outside the system libraries again.

Updates that actually install. Rush verifies a signature on every update before installing it. A mismatch between the manifest we signed and the one we served was making that check fail, so updates were quietly aborting. The pipeline now serves exactly the manifest it signed — updates verify and install on the next quit, no action needed.