feat(chat): multi-client live view — watch in-flight turns + user prompt on stream

- subscribe every open conversation on load + WS reconnect (resync), unsubscribe on tab close
- derive a stream-based 'generating' state for watchers (Composer running indicator)
- fold the user-message turn event so watchers render the prompt mid-turn (de-dup vs sender's optimistic echo)
- re-pin [email protected] / [email protected]; re-mirror contracts; add user-message to the exhaustiveness guard

1 files changed, 6 insertions, 0 deletions

diff --git a/src/core/wire/conformance.ts b/src/core/wire/conformance.ts
index d89772e..13be78c 100644
--- a/src/core/wire/conformance.ts
+++ b/src/core/wire/conformance.ts
@@ -12,6 +12,8 @@ export function assertAgentEventExhaustive(event: AgentEvent): string {
 			return "status";
 		case "turn-start":
 			return "turn-start";
+		case "user-message":
+			return "user-message";
 		case "text-delta":
 			return "text-delta";
 		case "reasoning-delta":
@@ -96,6 +98,10 @@ export function assertWsClientMessageExhaustive(msg: WsClientMessage): string {
 			return "invoke";
 		case "chat.send":
 			return "chat.send";
+		case "chat.subscribe":
+			return "chat.subscribe";
+		case "chat.unsubscribe":
+			return "chat.unsubscribe";
 		default:
 			return msg satisfies never;
 	}