feat(cli): Wave 0 — contracts for conversation list, last message, open tab

Additive contract changes for the CLI milestone (roadmap items 2 + 4):

@dispatch/wire 0.8.0 → 0.9.0:
- ConversationMeta { id, createdAt, lastActivityAt, title }

@dispatch/transport-contract 0.12.0 → 0.13.0:
- ConversationListResponse, LastMessageResponse, OpenConversationResponse
- SetTitleRequest, TitleResponse
- WS conversation.open broadcast (additive to WsServerMessage)

ConversationStore interface:
- listConversations(), getConversationMeta(), setConversationTitle()
- Stub implementations in real store + 11 test fakes (Wave 1 fills in)

Transport-http manifest: new routes declared
(GET /conversations, GET /conversations/:id/last,
POST /conversations/:id/open, PUT /conversations/:id/title)

1 files changed, 15 insertions, 0 deletions

diff --git a/packages/wire/src/index.ts b/packages/wire/src/index.ts
index 3edeabf..72b5e43 100644
--- a/packages/wire/src/index.ts
+++ b/packages/wire/src/index.ts
@@ -496,3 +496,18 @@ export interface TurnSteeringEvent {
 	readonly turnId: string;
 	readonly text: string;
 }
+
+// ─── Conversation metadata ───────────────────────────────────────────────────
+
+/**
+ * Metadata for a conversation, returned by `GET /conversations` (the list
+ * endpoint). The title defaults to the first user message (truncated) and can
+ * be set via `PUT /conversations/:id/title`. `createdAt` is set on first write;
+ * `lastActivityAt` is updated on every append.
+ */
+export interface ConversationMeta {
+	readonly id: string;
+	readonly createdAt: number;
+	readonly lastActivityAt: number;
+	readonly title: string;
+}