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/bots-queue/types.ts

@@ -1,4 +1,5 @@
 import type { BUN_SQLITE_COBBLE_BOTS_QUEUE } from "@/db/types/db";
+import type { TextLoopStep } from "@/src/harness/text/run-text-loop";
 
 export type BotJobContext = {
     job: BUN_SQLITE_COBBLE_BOTS_QUEUE;
@@ -21,6 +22,12 @@ export type BotJobContext = {
         progress?: string;
         checkpoint?: Record<string, unknown>;
     }) => Promise<boolean>;
+    /**
+     * Records a model turn as a step (`bots_queue_updates`), saves it as
+     * the job's progress and pushes it live. Pass it as the text loop's
+     * `onStep`. Best effort: a failed write never stops the job.
+     */
+    report: (step: TextLoopStep) => Promise<void>;
 };
 
 export type BotJobOutcome = {