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/dict/bot-queue-dict.ts

@@ -21,6 +21,17 @@ export const BotJobKinds = [
 
 export type BotJobKind = (typeof BotJobKinds)[number]["value"];
 
+/**
+ * A `bots_queue_updates` row: a model turn that called tools, or one that
+ * only wrote text.
+ */
+export const BotJobUpdateKinds = [
+    { title: "Tool", value: "tool" },
+    { title: "Note", value: "note" },
+] as const;
+
+export type BotJobUpdateKind = (typeof BotJobUpdateKinds)[number]["value"];
+
 /**
  * A reply job's title, and the bot's status line while it runs. The chat
  * shows a thinking row while a bot has it.