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)

2 files changed, 35 insertions, 0 deletions

diff --git a/packages/session-orchestrator/src/orchestrator.test.ts b/packages/session-orchestrator/src/orchestrator.test.ts
index 39996b0..9ee9704 100644
--- a/packages/session-orchestrator/src/orchestrator.test.ts
+++ b/packages/session-orchestrator/src/orchestrator.test.ts
@@ -79,6 +79,13 @@ function createInMemoryStore(): ConversationStore & {
 		async setReasoningEffort(conversationId, effort) {
 			effortData.set(conversationId, effort);
 		},
+		async listConversations() {
+			return [];
+		},
+		async getConversationMeta() {
+			return null;
+		},
+		async setConversationTitle() {},
 	};
 }
 
@@ -518,6 +525,13 @@ describe("turn-sealed event", () => {
 			async setReasoningEffort(conversationId, effort) {
 				await store.setReasoningEffort(conversationId, effort);
 			},
+			async listConversations() {
+				return [];
+			},
+			async getConversationMeta() {
+				return null;
+			},
+			async setConversationTitle() {},
 		};
 
 		const { orchestrator } = createSessionOrchestrator({
@@ -573,6 +587,13 @@ describe("turn-sealed event", () => {
 				return null;
 			},
 			async setReasoningEffort() {},
+			async listConversations() {
+				return [];
+			},
+			async getConversationMeta() {
+				return null;
+			},
+			async setConversationTitle() {},
 		};
 
 		const { orchestrator } = createSessionOrchestrator({
@@ -917,6 +938,13 @@ describe("turn metrics persistence", () => {
 				return null;
 			},
 			async setReasoningEffort() {},
+			async listConversations() {
+				return [];
+			},
+			async getConversationMeta() {
+				return null;
+			},
+			async setConversationTitle() {},
 		};
 
 		const { orchestrator } = createSessionOrchestrator({
diff --git a/packages/session-orchestrator/src/queue.test.ts b/packages/session-orchestrator/src/queue.test.ts
index c1f12da..2aba3d4 100644
--- a/packages/session-orchestrator/src/queue.test.ts
+++ b/packages/session-orchestrator/src/queue.test.ts
@@ -75,6 +75,13 @@ function createInMemoryStore(): ConversationStore & {
 		async setReasoningEffort(conversationId, effort) {
 			effortData.set(conversationId, effort);
 		},
+		async listConversations() {
+			return [];
+		},
+		async getConversationMeta() {
+			return null;
+		},
+		async setConversationTitle() {},
 	};
 }