feat(chat): Swift chat parity (abort/sessions/stream)

apps/shared/ClawdisKit/Sources/ClawdisChatUI/ChatTransport.swift

@@ -4,6 +4,7 @@ public enum ClawdisChatTransportEvent: Sendable {
     case health(ok: Bool)
     case tick
     case chat(ClawdisChatEventPayload)
+    case agent(ClawdisAgentEventPayload)
     case seqGap
 }
 
@@ -16,6 +17,9 @@ public protocol ClawdisChatTransport: Sendable {
         idempotencyKey: String,
         attachments: [ClawdisChatAttachmentPayload]) async throws -> ClawdisChatSendResponse
 
+    func abortRun(sessionKey: String, runId: String) async throws
+    func listSessions(limit: Int?) async throws -> ClawdisChatSessionsListResponse
+
     func requestHealth(timeoutMs: Int) async throws -> Bool
     func events() -> AsyncStream<ClawdisChatTransportEvent>
 
@@ -24,4 +28,18 @@ public protocol ClawdisChatTransport: Sendable {
 
 extension ClawdisChatTransport {
     public func setActiveSessionKey(_: String) async throws {}
+
+    public func abortRun(sessionKey _: String, runId _: String) async throws {
+        throw NSError(
+            domain: "ClawdisChatTransport",
+            code: 0,
+            userInfo: [NSLocalizedDescriptionKey: "chat.abort not supported by this transport"])
+    }
+
+    public func listSessions(limit _: Int?) async throws -> ClawdisChatSessionsListResponse {
+        throw NSError(
+            domain: "ClawdisChatTransport",
+            code: 0,
+            userInfo: [NSLocalizedDescriptionKey: "sessions.list not supported by this transport"])
+    }
 }