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, 21 insertions, 2 deletions

diff --git a/packages/cli/src/args.ts b/packages/cli/src/args.ts
index d4ed0e9..30fa309 100644
--- a/packages/cli/src/args.ts
+++ b/packages/cli/src/args.ts
@@ -27,7 +27,13 @@ export type ParsedCommand =
 			readonly showReasoning: boolean;
 			readonly open: boolean;
 	  }
-	| { readonly kind: "list"; readonly server: string; readonly query?: string }
+	| {
+			readonly kind: "list";
+			readonly server: string;
+			readonly query?: string;
+			readonly status?: string;
+			readonly all: boolean;
+	  }
 	| { readonly kind: "open"; readonly server: string; readonly conversationId: string }
 	| { readonly kind: "read"; readonly server: string; readonly conversationId: string }
 	| {
@@ -73,11 +79,18 @@ export function parseArgs(argv: readonly string[], opts: ParseOpts): ParsedComma
 	if (first === "list") {
 		let server = opts.defaultServer;
 		let query: string | undefined;
+		let status: string | undefined;
+		let all = false;
 		for (let i = 1; i < argv.length; i++) {
 			const arg = argv[i] as string;
 			if (arg === "--server") {
 				if (i + 1 >= argv.length) return { kind: "error", message: "--server requires a value" };
 				server = argv[++i] as string;
+			} else if (arg === "--status") {
+				if (i + 1 >= argv.length) return { kind: "error", message: "--status requires a value" };
+				status = argv[++i];
+			} else if (arg === "--all") {
+				all = true;
 			} else if (arg.startsWith("--")) {
 				return { kind: "error", message: `Unknown flag: ${arg}` };
 			} else if (query !== undefined) {
@@ -86,7 +99,13 @@ export function parseArgs(argv: readonly string[], opts: ParseOpts): ParsedComma
 				query = arg;
 			}
 		}
-		return { kind: "list", server, ...(query !== undefined && { query }) };
+		return {
+			kind: "list",
+			server,
+			...(query !== undefined && { query }),
+			...(status !== undefined && { status }),
+			all,
+		};
 	}
 
 	if (first === "read") {