워치는 5초짜리 화면이야

  WRIST (not on the private network, never will be)
    tap the complication, or press the Action Button
      -> dictation opens (one door)
      -> the words commit to the watch's own queue            <- the capture is safe here
      -> transferUserInfo (the record) + sendMessage (the ring)

  PHONE (the watch's engine)
    one door for both deliveries, a ledger that drops the echo
      -> the phone's capture store, idempotent on the capture id
      -> the outbox drains to the engine at home when it can

  BACK TO THE WRIST
    the transfer's didFinish        -> the watch lets go of the entry
    the ring's reply                 -> "the phone has it", before didFinish arrives

import Foundation

/// What the wrist may say, from facts it actually holds.
struct WristStatus: Equatable, Sendable {
    var waiting: Int            // every entry still in the watch's own queue (no didFinish yet)
    var handedOver: Int         // the phone answered the ring: it has these, the transfer is still settling
    var capturedThisSession: Bool
    var phoneReachable: Bool

    /// Three different facts, never two: something waits, something was delivered, nothing happened yet.
    var line: String {
        let stillOnWrist = waiting - handedOver
        if stillOnWrist > 0 {
            return phoneReachable ? "\(stillOnWrist) sending to the phone" : "\(stillOnWrist) waiting for the phone"
        }
        if capturedThisSession { return "The phone has it" }
        return "Nothing waiting"
    }
}