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.ts

@@ -0,0 +1,45 @@
+import type { BotJobUpdateKind } from "@/src/dict/bot-queue-dict";
+import type { TextLoopStep } from "@/src/harness/text/run-text-loop";
+
+/**
+ * Longest step line kept: the panel shows one line per step.
+ */
+const MaxStepChars = 200;
+
+/**
+ * One model turn as a `bots_queue_updates` row: the tools it called, or
+ * the first line of what it wrote. Null for an empty turn. Never the tool
+ * arguments, which can hold anything the bot typed.
+ */
+export default function describeJobStep({
+    text,
+    tool_calls,
+    index,
+    candidate,
+}: TextLoopStep): {
+    kind: BotJobUpdateKind;
+    text: string;
+    metadata: Record<string, unknown>;
+} | null {
+    const metadata = { step: index, model: candidate.model.slug };
+
+    if (tool_calls.length) {
+        const tools = [...new Set(tool_calls.map((call) => call.name))];
+
+        return {
+            kind: "tool",
+            text: `Using ${tools.join(", ")}`,
+            metadata: { ...metadata, tools },
+        };
+    }
+
+    const line = text?.trim().split("\n").find((l) => l.trim())?.trim();
+
+    if (!line) return null;
+
+    return {
+        kind: "note",
+        text: line.length > MaxStepChars ? `${line.slice(0, MaxStepChars - 1)}…` : line,
+        metadata,
+    };
+}