sim-platform-ubuntu-pc

The reference native capsule. It publishes distinct desktop and headless Cards for Ubuntu on x86_64 and aarch64; architecture remains descriptive Card data.

LocalCheckAdapter is the qualified local implementation-check boundary. Boot configuration supplies exact CommandSpec allowlist entries, opaque native resource mappings, UbuntuProcess, and registered BwrapLauncher instances. Packet tooling submits only a LocalCheckRequest containing the installed command identity. The adapter wraps execution in the durable operation lifecycle, clears ambient environment, keeps networking absent in bwrap, accounts for writable roots, removes owned scratch contents, and reconciles the declared output contract through a distinct observer.