swift-project-standardlisted

# Swift Project Standard This skill is the guiding standard for **any** Swift work. Apply it by default; don't wait to be asked. Its spine: **trust is placed not in the model, but in the machine-checkable code that constrains it.** In Swift, like Rust, most of that scaffold is the compiler — types, optionality, exhaustiveness, and (in Swift 6) data-race safety are enforced at compile time with no type erasure, so there's **no runtime type-checker to bolt on** (unlike the Python sibling's beartype). The job here is to (a) keep the few escape hatches shut and turn on Swift 6 complete strict concurrency, (b) push every external dependency behind a protocol so the model is hot-swappable, (c) organize deep and name-navigable, and (d) mechanize the implicit knowledge a human would otherwise hold — via a zero-warning gate, a per-target contract, and drift guards. The agent's output ceiling equals the tightness of that loop. Baseline: **Swift 6.x** (`// swift-tools-version: 6.0`, `swiftLanguageModes: [.v6]`), complete strict concurrency, `warnings-as-errors` at the gate, `swift-format` (toolchain-bundled), `SwiftLint` (community, `--strict`), `Codable` + newtypes, `os.Logger`, a Codable `AppConfig`, and `XcodeGen` for a thin app shell when there's a UI. This standard is the **project-level engineering charter** (the gate + architecture conventions). For *how to write the implementation inside a target*, it delegates to the existing implementation skills — `swift-concurrency`, `sw