Native packaging

build-macos-app.sh builds the release executable with the normal Cargo lockfile and creates target/release/Tessera.app. It uses the local Rust toolchain and official Cargo sources; no mirror or Docker configuration is installed, and no automated tests run. CARGO_NET_OFFLINE=true can reuse an already populated official dependency cache.

The local bundle has identifier com.entroia.tessera and can be opened from Finder. It is a development app, without a distribution signature or notarization. The CI workflow only checks this script's shell syntax on Linux; native bundle construction and window presentation are verified on macOS.

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