Agent Skills: adversarial-swift

Use this skill to gate Swift language code with a pass/fail adversarial review — a single blind reviewer subagent judges a diff or file set against 36 decidable rules covering concurrency (unresumed continuations, cancellation checks, async let, TaskGroup, @concurrent), property invariants (stored-derived state, private(set), observers skipped in init, discard self), error handling (underlying errors preserved, rethrows, Result.get(), #file/#line capture), enum evolution (@unknown default, CaseIterable, synthesized Comparable, caseless namespaces), API surface (memberwise inits, OptionSet, opaque returns, unavailable stubs, Never, @autoclosure), collections (reduce(into:), mapValues, count(where:), dictionary default subscripts), and control flow and strings (branch-assigned let, raw strings, validated bytes). Works on any Swift target including server-side and CLI; verdicts only, never fixes. For SwiftUI use adversarial-swift-ui.