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

2 files changed, 20 insertions, 3 deletions

diff --git a/src/core/wire/conformance.test.ts b/src/core/wire/conformance.test.ts
index 690ba4e..a258873 100644
--- a/src/core/wire/conformance.test.ts
+++ b/src/core/wire/conformance.test.ts
@@ -27,6 +27,7 @@ describe("classifies every AgentEvent type", () => {
 	const samples: AgentEvent[] = [
 		{ type: "status", conversationId: "c1", status: "idle" },
 		{ type: "turn-start", conversationId: "c1", turnId: "t1" },
+		{ type: "user-message", conversationId: "c1", turnId: "t1", text: "hi" },
 		{ type: "text-delta", conversationId: "c1", turnId: "t1", delta: "hi" },
 		{ type: "reasoning-delta", conversationId: "c1", turnId: "t1", delta: "thinking" },
 		{
@@ -81,6 +82,7 @@ describe("classifies every AgentEvent type", () => {
 		expect(labels).toEqual([
 			"status",
 			"turn-start",
+			"user-message",
 			"text-delta",
 			"reasoning-delta",
 			"tool-call",
@@ -94,8 +96,8 @@ describe("classifies every AgentEvent type", () => {
 		]);
 	});
 
-	it("covers all 12 AgentEvent variants", () => {
-		expect(samples).toHaveLength(12);
+	it("covers all 13 AgentEvent variants", () => {
+		expect(samples).toHaveLength(13);
 	});
 });
 
@@ -148,9 +150,18 @@ describe("classifies every WsClientMessage type", () => {
 			{ type: "unsubscribe" as const, surfaceId: "s" },
 			{ type: "invoke" as const, surfaceId: "s", actionId: "a" },
 			{ type: "chat.send" as const, message: "hi" },
+			{ type: "chat.subscribe" as const, conversationId: "c1" },
+			{ type: "chat.unsubscribe" as const, conversationId: "c1" },
 		];
 		const labels = msgs.map(assertWsClientMessageExhaustive);
-		expect(labels).toEqual(["subscribe", "unsubscribe", "invoke", "chat.send"]);
+		expect(labels).toEqual([
+			"subscribe",
+			"unsubscribe",
+			"invoke",
+			"chat.send",
+			"chat.subscribe",
+			"chat.unsubscribe",
+		]);
 	});
 });
 
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;
 	}