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/describe-job-step.test.ts

@@ -0,0 +1,47 @@
+import { describe, expect, test } from "bun:test";
+import type { HarnessCandidate } from "@/src/harness/types";
+import describeJobStep from "./describe-job-step";
+
+const candidate = { model: { slug: "deepseek/deepseek-chat:free" } } as HarnessCandidate;
+
+describe("describeJobStep", () => {
+    test("names each tool once, never its arguments", () => {
+        expect(
+            describeJobStep({
+                index: 2,
+                text: "Let me look.",
+                candidate,
+                tool_calls: [
+                    { id: "a", name: "sandbox_execute_bash", arguments: '{"command":"cat secret"}' },
+                    { id: "b", name: "sandbox_execute_bash", arguments: "{}" },
+                    { id: "c", name: "update_memory", arguments: "{}" },
+                ],
+            }),
+        ).toEqual({
+            kind: "tool",
+            text: "Using sandbox_execute_bash, update_memory",
+            metadata: {
+                step: 2,
+                model: "deepseek/deepseek-chat:free",
+                tools: ["sandbox_execute_bash", "update_memory"],
+            },
+        });
+    });
+
+    test("keeps the first line of a text-only turn, cut to one line", () => {
+        const step = describeJobStep({
+            index: 0,
+            text: `\n  ${"a".repeat(250)}\nSecond line`,
+            candidate,
+            tool_calls: [],
+        });
+
+        expect(step?.kind).toBe("note");
+        expect(step?.text).toHaveLength(200);
+        expect(step?.text.endsWith("…")).toBe(true);
+    });
+
+    test("skips an empty turn", () => {
+        expect(describeJobStep({ index: 0, text: "  ", candidate, tool_calls: [] })).toBeNull();
+    });
+});