feat(ws): handle conversation.open broadcast — open/focus tab from CLI --open

Consume the conversation.open handoff ([email protected], [email protected]).
Re-pinned file: deps + re-mirrored .dispatch/*.reference.md.

- WS adapter (logic.ts + index.ts): parse + route the new top-level
  "conversation.open" WsServerMessage to an onConversationOpen handler
- app store: openConversation(id) opens (or focuses) a tab — creates a chat
  store, loads history, subscribes to live turns, creates+selects the tab
- conformance guard + WS adapter tests cover the new type
- backend also shipped conversation metadata endpoints (GET /conversations,
  GET /conversations/:id/last, GET/PUT /conversations/:id/title) — mirrored
  but not yet consumed by the FE

682 tests green.

1 files changed, 20 insertions, 1 deletions

diff --git a/.dispatch/wire.reference.md b/.dispatch/wire.reference.md
index c2c4d43..e96c353 100644
--- a/.dispatch/wire.reference.md
+++ b/.dispatch/wire.reference.md
@@ -4,9 +4,13 @@
 > types WITHOUT following the `file:` dep symlink out of this repo (which hangs on a permission
 > prompt). Your CODE still imports `@dispatch/wire` normally — this file is for READING only.
 >
-> **Orchestrator:** SNAPSHOT of `[email protected]` (message queue + steering). Regenerate
+> **Orchestrator:** SNAPSHOT of `[email protected]` (conversation metadata). Regenerate
 > whenever `@dispatch/wire` changes.
 >
+> **2026-06-21 delta (conversation.open handoff — package bumped `0.8.0` → `0.9.0`, ADDITIVE):**
+> adds `ConversationMeta` — metadata for a conversation (id, title, createdAt, lastActivityAt),
+> returned by `GET /conversations` (the list endpoint, see `[email protected]`).
+>
 > **2026-06-21 delta (message-queue + steering handoff — package bumped `0.7.0` → `0.8.0`, ADDITIVE):**
 > adds the per-conversation **message queue** + **steering** feature. While a turn is GENERATING,
 > a client enqueues a user message (via the `chat.queue` WS op or `POST /conversations/:id/queue`,
@@ -577,4 +581,19 @@ 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;
+}
 ```