Watch: show subagent requests on the parent's card, and settle threads by swipe, Settle all and the thread screen

watch/WristCode/Demo/DemoGateway.swift

@@ -1,6 +1,7 @@
 // Fixture data shaped like the docs/api.md examples, served by an in-memory gateway. Demo mode and
 // SwiftUI previews use it, so every screen renders without a live gateway. It reacts to writes:
-// answering an approval moves the thread to working, a reply restarts a finished thread, and so on.
+// answering an approval moves the thread to working, a reply restarts a finished thread, settling
+// hides a thread from the feed, and so on.
 
 import Foundation
 
@@ -12,6 +13,8 @@ actor DemoGateway: GatewayAPI {
     private let hosts: [HostSummary]
     private let projectHosts: [ProjectsResponse.Host]
     private var statusResponse: StatusResponse
+    /// Ids of settled threads, which the feed leaves out.
+    private var settled: Set<String> = []
     private var nextId = 1
 
     init(now: Date = .now) {
@@ -24,6 +27,7 @@ actor DemoGateway: GatewayAPI {
     }
 
     func feed() async throws -> Feed {
+        let items = items.filter { !settled.contains($0.id) }
         let needsYou = items.filter(\.phase.needsYou).sorted { $0.updatedAt < $1.updatedAt }
         let working = items.filter(\.phase.isWorking).sorted { $0.updatedAt > $1.updatedAt }
         let recent = items.filter { $0.phase == .completed || $0.phase == .failed }
@@ -42,6 +46,7 @@ actor DemoGateway: GatewayAPI {
 
     func sendMessage(hostId: String, threadId: String, text: String) async throws {
         try update(hostId, threadId) { item in
+            settled.remove(item.id)
             append(Message(id: newId(), role: .user, text: text, createdAt: .now), to: item.id)
             if !item.phase.isWorking {
                 item.phase = .running
@@ -50,10 +55,18 @@ actor DemoGateway: GatewayAPI {
         }
     }
 
+    /// Answers go to the thread that asked. For a card showing a subagent's request, that is the
+    /// subagent in `via`, and the parent itself has nothing to answer.
     func respond(hostId: String, threadId: String, request: RespondRequest) async throws {
-        try update(hostId, threadId) { item in
-            guard item.request != nil else { throw GatewayError.http(status: 409, message: "Already answered.") }
+        let index = items.firstIndex { $0.requestThread == (hostId, threadId) }
+            ?? items.firstIndex { $0.hostId == hostId && $0.threadId == threadId }
+        guard let index else { throw GatewayError.http(status: 404, message: "Unknown thread.") }
+        try update(items[index].hostId, items[index].threadId) { item in
+            guard item.request != nil, item.requestThread == (hostId, threadId) else {
+                throw GatewayError.http(status: 409, message: "Already answered.")
+            }
             item.request = nil
+            item.via = nil
             switch request {
             case let .decision(_, decision) where decision == .decline || decision == .cancel:
                 item.phase = .completed
@@ -75,6 +88,11 @@ actor DemoGateway: GatewayAPI {
         }
     }
 
+    func settle(hostId: String, threadId: String) async throws {
+        guard let item = item(hostId, threadId) else { throw GatewayError.http(status: 404, message: "Unknown thread.") }
+        settled.insert(item.id)
+    }
+
     func projects() async throws -> ProjectsResponse {
         ProjectsResponse(hosts: projectHosts)
     }
@@ -194,6 +212,17 @@ struct DemoFixtures {
                         allowCustomAnswer: true, multiSelect: true),
                 ]))
 
+        // A subagent's request, shown on the card of the thread that started it.
+        let homelab = FeedItem(
+            hostId: "mac-mini", hostLabel: "Mac mini", threadId: "t-homelab", projectId: "p-wristlab",
+            projectTitle: "WristLab", title: "HomeLab Stats Apple Watch App", phase: .waitingForApproval,
+            updatedAt: ago(4), lastMessage: "Delegated a PATH check to the Mac mini. Waiting on it before I wire up the build.",
+            request: PendingRequest(
+                id: "r-path", kind: "command", prompt: "brew install jq", reason: nil,
+                options: [.init(decision: .accept, label: "Allow"), .init(decision: .decline, label: "Deny")],
+                questions: []),
+            via: .init(hostId: "mac-mini", threadId: "t-path", title: "Check Panama PATH"))
+
         let scaffold = FeedItem(
             hostId: "mac-mini", hostLabel: "Mac mini", threadId: "t-scaffold", projectId: "p-wc-mac",
             projectTitle: "wristcode", title: "Watch app scaffold", phase: .running, updatedAt: ago(0.5),
@@ -214,7 +243,18 @@ struct DemoFixtures {
             projectTitle: "cdn", title: "Fix CDN headers", phase: .failed, updatedAt: ago(140),
             lastMessage: "cargo test failed: 2 tests in headers.rs", request: nil)
 
-        items = [approval, question, release, scaffold, containerfile, nextjs, cdn]
+        let statusScreens = FeedItem(
+            hostId: "laptop", hostLabel: "Laptop", threadId: "t-status", projectId: "p-wc-laptop",
+            projectTitle: "wristcode", title: "Status screens", phase: .completed, updatedAt: ago(35),
+            lastMessage: "Done. Status, environment and notification screens are in TestFlight build 202611011516.",
+            request: nil)
+
+        let hyprlock = FeedItem(
+            hostId: "server-gib", hostLabel: "server-gib", threadId: "t-hyprlock", projectId: "p-panama",
+            projectTitle: "Panama", title: "Fix hyprlock crash", phase: .completed, updatedAt: ago(95),
+            lastMessage: "Fixed. hyprlock no longer crashes when a monitor sleeps.", request: nil)
+
+        items = [approval, question, release, homelab, scaffold, containerfile, statusScreens, nextjs, hyprlock, cdn]
 
         func m(_ id: String, _ role: Message.Role, _ minutes: Double, _ text: String) -> Message {
             Message(id: id, role: role, text: text, createdAt: ago(minutes))
@@ -234,6 +274,10 @@ struct DemoFixtures {
                 m("r1", .user, 25, "Get the watch app ready for TestFlight."),
                 m("r2", .assistant, 6, "The build is ready. Which checks should run first?"),
             ],
+            homelab.id: [
+                m("h1", .user, 30, "Build a HomeLab stats app for the watch."),
+                m("h2", .assistant, 4, "Delegated a PATH check to the Mac mini. Waiting on it before I wire up the build."),
+            ],
             scaffold.id: [
                 m("c1", .user, 4, "Scaffold the watch app with XcodeGen."),
                 m("c2", .assistant, 0.5, "Writing ThreadListView.swift"),
@@ -247,6 +291,14 @@ struct DemoFixtures {
                 m("e2", .assistant, 80, "Updating next and eslint-config-next, then running the build."),
                 m("e3", .assistant, 62, "Done. Next.js is on 17.1 and the build passes. Want me to commit it?"),
             ],
+            statusScreens.id: [
+                m("s1", .user, 120, "Build the status, environment and notification screens."),
+                m("s2", .assistant, 35, "Done. Status, environment and notification screens are in TestFlight build 202611011516."),
+            ],
+            hyprlock.id: [
+                m("k1", .user, 110, "hyprlock crashes when a monitor sleeps. Fix it."),
+                m("k2", .assistant, 95, "Fixed. hyprlock no longer crashes when a monitor sleeps."),
+            ],
             cdn.id: [
                 m("f1", .user, 150, "Fix the cache headers the CDN sends for images."),
                 m("f2", .assistant, 140, "cargo test failed: 2 tests in headers.rs"),