feat: conversation lifecycle status (active/idle/closed) for tab persistence

Implement roadmap item 9: tab persistence across devices.

Wire (0.10.0):
- Add ConversationStatus type (active | idle | closed)
- Add status field to ConversationMeta

Transport-contract (0.14.0):
- Add conversation.statusChanged WS message to WsServerMessage union
- Re-export ConversationStatus

Conversation-store:
- Track status in ConversationMetaRow (default: idle)
- getConversationStatus / setConversationStatus methods
- listConversations accepts { status: ConversationStatus[] } filter
- Old meta rows without status default to idle on read

Session-orchestrator:
- conversationStatusChanged hook descriptor
- Emit on transitions: idle→active (turn start), active→idle (turn settle),
  →closed (closeConversation)
- Persist status to store as fire-and-forget side effect
- Declare hook in manifest contributes.hooks

Transport-ws:
- Subscribe to conversationStatusChanged hook
- Broadcast conversation.statusChanged WS message to all clients

Transport-http:
- GET /conversations?status=active,idle filter (parseStatusFilter pure helper)
- POST /conversations/:id/close now sets status to closed

CLI:
- dispatch list defaults to active,idle (excludes closed)
- --status <state> flag to filter by single status
- --all flag to include closed

FE handoff: frontend-conversation-lifecycle-handoff.md

4 files changed, 66 insertions, 5 deletions

diff --git a/packages/transport-http/src/app.test.ts b/packages/transport-http/src/app.test.ts
index cb14648..789efce 100644
--- a/packages/transport-http/src/app.test.ts
+++ b/packages/transport-http/src/app.test.ts
@@ -134,6 +134,10 @@ function createFakeConversationStore(
 			return null;
 		},
 		async setConversationTitle() {},
+		async getConversationStatus() {
+			return null;
+		},
+		async setConversationStatus() {},
 	};
 }
 
@@ -851,6 +855,10 @@ describe("GET /conversations/:id", () => {
 					return null;
 				},
 				async setConversationTitle() {},
+				async getConversationStatus() {
+					return null;
+				},
+				async setConversationStatus() {},
 			};
 			const app = createApp({
 				conversationStore: store,
@@ -915,6 +923,10 @@ describe("GET /conversations/:id", () => {
 				return null;
 			},
 			async setConversationTitle() {},
+			async getConversationStatus() {
+				return null;
+			},
+			async setConversationStatus() {},
 		};
 		const app = createApp({
 			conversationStore: store,
@@ -1048,6 +1060,10 @@ describe("GET /conversations/:id/metrics", () => {
 				return null;
 			},
 			async setConversationTitle() {},
+			async getConversationStatus() {
+				return null;
+			},
+			async setConversationStatus() {},
 		};
 		const app = createApp({
 			conversationStore: brokenStore,
@@ -2014,6 +2030,10 @@ describe("PUT /conversations/:id/reasoning-effort", () => {
 				return null;
 			},
 			async setConversationTitle() {},
+			async getConversationStatus() {
+				return null;
+			},
+			async setConversationStatus() {},
 		};
 		const app = createApp({
 			conversationStore: store,
@@ -2034,9 +2054,9 @@ describe("PUT /conversations/:id/reasoning-effort", () => {
 
 describe("GET /conversations", () => {
 	const sampleConvos: ConversationMeta[] = [
-		{ id: "conv-1", createdAt: 1000, lastActivityAt: 2000, title: "First" },
-		{ id: "conv-2", createdAt: 1500, lastActivityAt: 2500, title: "Second" },
-		{ id: "other-1", createdAt: 3000, lastActivityAt: 4000, title: "Other" },
+		{ id: "conv-1", createdAt: 1000, lastActivityAt: 2000, title: "First", status: "idle" },
+		{ id: "conv-2", createdAt: 1500, lastActivityAt: 2500, title: "Second", status: "idle" },
+		{ id: "other-1", createdAt: 3000, lastActivityAt: 4000, title: "Other", status: "idle" },
 	];
 
 	function appWithList(list: ConversationMeta[]) {
diff --git a/packages/transport-http/src/app.ts b/packages/transport-http/src/app.ts
index 7db5cba..e9f56c9 100644
--- a/packages/transport-http/src/app.ts
+++ b/packages/transport-http/src/app.ts
@@ -30,6 +30,7 @@ import {
 	parseQueueBody,
 	parseReasoningEffortBody,
 	parseSinceSeq,
+	parseStatusFilter,
 	parseWarmBody,
 	parseWindowParam,
 	serializeEventLine,
@@ -551,7 +552,13 @@ export function createApp(opts: CreateServerOptions): Hono {
 
 	app.get("/conversations", async (c) => {
 		try {
-			const all = await opts.conversationStore.listConversations();
+			// Optional `?status=` comma-separated filter (e.g. "active,idle").
+			// Default: all statuses. Invalid values are silently ignored.
+			const rawStatus = c.req.query("status");
+			const statusFilter = parseStatusFilter(rawStatus);
+			const all = await opts.conversationStore.listConversations(
+				statusFilter !== undefined ? { status: statusFilter } : undefined,
+			);
 			// Optional `?q=` filters by id prefix (short-id resolution). A
 			// missing/empty/whitespace-only `q` is ignored → return all.
 			const rawQ = c.req.query("q");
@@ -560,6 +567,7 @@ export function createApp(opts: CreateServerOptions): Hono {
 			log.info("conversations: list", {
 				count: conversations.length,
 				...(q.length > 0 ? { q } : {}),
+				...(statusFilter !== undefined ? { status: statusFilter.join(",") } : {}),
 			});
 			const body: ConversationListResponse = { conversations };
 			return c.json(body, 200);
diff --git a/packages/transport-http/src/logic.ts b/packages/transport-http/src/logic.ts
index d20713c..5111c75 100644
--- a/packages/transport-http/src/logic.ts
+++ b/packages/transport-http/src/logic.ts
@@ -1,4 +1,9 @@
-import type { AgentEvent, ChatMessage, ReasoningEffort } from "@dispatch/kernel";
+import type {
+	AgentEvent,
+	ChatMessage,
+	ConversationStatus,
+	ReasoningEffort,
+} from "@dispatch/kernel";
 
 const VALID_REASONING_EFFORTS: readonly ReasoningEffort[] = [
 	"low",
@@ -8,6 +13,30 @@ const VALID_REASONING_EFFORTS: readonly ReasoningEffort[] = [
 	"max",
 ];
 
+const VALID_STATUSES: readonly ConversationStatus[] = ["active", "idle", "closed"];
+
+/**
+ * Pure: parse a `?status=` query value into a list of valid ConversationStatus
+ * values. Returns `undefined` when the input is missing/empty (no filter).
+ * Invalid values are silently dropped; if ALL values are invalid, returns
+ * `undefined` (no filter — shows all).
+ */
+export function parseStatusFilter(
+	raw: string | undefined,
+): readonly ConversationStatus[] | undefined {
+	if (raw === undefined) return undefined;
+	const trimmed = raw.trim();
+	if (trimmed.length === 0) return undefined;
+	const parts = trimmed
+		.split(",")
+		.map((s) => s.trim())
+		.filter((s) => s.length > 0);
+	const valid = parts.filter((p): p is ConversationStatus =>
+		VALID_STATUSES.includes(p as ConversationStatus),
+	);
+	return valid.length > 0 ? valid : undefined;
+}
+
 export function isValidReasoningEffort(value: unknown): value is ReasoningEffort {
 	return typeof value === "string" && VALID_REASONING_EFFORTS.includes(value as ReasoningEffort);
 }
diff --git a/packages/transport-http/src/server.bun.test.ts b/packages/transport-http/src/server.bun.test.ts
index 3b6ee8f..a15a2c7 100644
--- a/packages/transport-http/src/server.bun.test.ts
+++ b/packages/transport-http/src/server.bun.test.ts
@@ -61,6 +61,10 @@ function fakeConversationStore(): ConversationStore {
 			return null;
 		},
 		async setConversationTitle() {},
+		async getConversationStatus() {
+			return null;
+		},
+		async setConversationStatus() {},
 	};
 }