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

1 files changed, 6 insertions, 4 deletions

diff --git a/packages/cli/src/http.ts b/packages/cli/src/http.ts
index 8434519..876f570 100644
--- a/packages/cli/src/http.ts
+++ b/packages/cli/src/http.ts
@@ -96,16 +96,18 @@ export async function fetchModels(deps: FetchDeps, opts: FetchModelsOpts): Promi
 interface FetchConversationsOpts {
 	readonly server: string;
 	readonly query?: string;
+	readonly status?: string;
 }
 
 export async function fetchConversations(
 	deps: FetchDeps,
 	opts: FetchConversationsOpts,
 ): Promise<ConversationListResponse> {
-	const url =
-		opts.query !== undefined
-			? `${opts.server}/conversations?q=${encodeURIComponent(opts.query)}`
-			: `${opts.server}/conversations`;
+	const params = new URLSearchParams();
+	if (opts.query !== undefined) params.set("q", opts.query);
+	if (opts.status !== undefined) params.set("status", opts.status);
+	const qs = params.toString();
+	const url = qs.length > 0 ? `${opts.server}/conversations?${qs}` : `${opts.server}/conversations`;
 	const res = await deps.fetchImpl(url);
 
 	if (!res.ok) {