Swift Rust-Core Boundary

Own the architecture where a native SwiftUI shell fronts a Rust application runtime. Ordinary Swift code writing/review/refactor belongs to separate owners.

Apply runtime-trust.md, then read rust-core-boundary.md. Also read apple-platform-shell.md for StoreKit, Keychain, notifications, background tasks, files, widgets, intents, or lifecycle. Resolve every relative link in this file against the directory containing this SKILL.md, never the plugin skills root.