Initial release

Sources/KnotchyCore/Time/KnotchyClock.swift

@@ -0,0 +1,15 @@
+/// `ContinuousClock` keeps counting while the Mac sleeps, so an expired idle countdown fires on wake.
+public protocol KnotchyClock: Sendable {
+    var now: ContinuousClock.Instant { get }
+    func sleep(until deadline: ContinuousClock.Instant) async throws
+}
+
+public struct SystemClock: KnotchyClock {
+    public init() {}
+
+    public var now: ContinuousClock.Instant { .now }
+
+    public func sleep(until deadline: ContinuousClock.Instant) async throws {
+        try await Task.sleep(until: deadline, clock: .continuous)
+    }
+}