Add computer switching, crew reporting, job steps and markdown chat

- Bots have a current computer (bots.computer_id), switched from the chat
  header beside the model button or by clicking a computer the bot names
  ([computer:ID]); tasks run on it by default
- search_computers runs one read-only command on all of a bot's computers;
  chat replies know their computers (compose-computers-note)
- The coordinator can use every computer and grants or revokes crew access
  with assign_computer
- Delegated jobs record requested_by_bot_id; the worker's result or failure
  is reported back in the coordinator's conversation
- bots_queue_updates records each model turn of a job, pushed live and shown
  in the working-on panel
- Live relay: every process pushes new messages, job steps and bot changes
  from the database to its own sockets, so work done elsewhere shows live
- Bot messages render as markdown (react-markdown + remark-gfm, no raw HTML)
  with twui components; rail previews are plain text
- Fix header button overflow in the model and computer selects
- Bump @moduletrace/twui to 0.1.2

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/websocket/(functions)/grab-connected-user-ids.ts

@@ -0,0 +1,17 @@
+import { getAllRooms } from "../(data)/rooms";
+
+/**
+ * The users with an open socket on this process (every socket joins
+ * `public` on open).
+ */
+export default function grabConnectedUserIds() {
+    const ids = new Set<string>();
+
+    for (const ws of getAllRooms().get("public") || []) {
+        if (ws.data.user?.id && ws.readyState === WebSocket.OPEN) {
+            ids.add(String(ws.data.user.id));
+        }
+    }
+
+    return ids;
+}