Tell every bot its own id, in every run

The bot's id never reached its prompt: `composeBotPrompt` only took its
instructions, the appendix, its memory and its workspace, and
`grabBotPrompt` never passed `bot.id` or `bot.name` on. A bot could only
learn its id by accident, from a tool description that named it, so
"which bot am I" was unanswerable in most contexts.

- Open the prompt with who the bot is (`composeIdentity`): its name,
  whether it's the coordinator or a worker, its role, and its id, said
  to be how tools and refs point back at it. `grabBotPrompt` now passes
  the bot, which covers chat replies, tasks, routines and delegated
  tasks, since both runners build their prompt there.
- Turn the notes' example refs into functions bound to the running bot:
  `chatReplyNote`, `botFilesNote` and `coordinatorReplyNote` take its id,
  so the folder-ref example no longer points at a hardcoded `owner_id: 5`
  (another bot's folder) nor `[bot:3]`. ComputerFilesNote keeps the
  computer it's given.
- Stop `create_task` from hiding the worker's own id in its own chat.

Tests: four new `composeBotPrompt` cases pin the identity block (worker,
coordinator, unnamed, no bot at all), and a new `harness-prompts.test.ts`
checks each note's own-folder and self refs point at exactly the running
bot, for three ids.

src/data/harness-prompts.test.ts

@@ -0,0 +1,57 @@
+import { describe, expect, test } from "bun:test";
+import {
+    botFilesNote,
+    chatReplyNote,
+    ComputerFilesNote,
+    coordinatorReplyNote,
+    TasksNote,
+} from "./harness-prompts";
+
+/**
+ * Every note a bot reads names it by its own id, so a bot copying an
+ * example never points at another bot's folder, conversation or task.
+ */
+const bot_ids = [1, 5, 42] as const;
+
+/**
+ * The bot ids a note's own-folder examples point at, in order.
+ */
+function folderOwners(note: string) {
+    return [...note.matchAll(/\[folder:bot:(\d+):/g)].map((match) => match[1]);
+}
+
+describe("harness prompts", () => {
+    for (const bot_id of bot_ids) {
+        test(`chat reply note names bot ${bot_id}'s own folder`, () => {
+            const owners = folderOwners(chatReplyNote({ bot_id }));
+
+            expect(owners).toEqual([String(bot_id)]);
+        });
+
+        test(`files note names bot ${bot_id}'s own folder`, () => {
+            const owners = folderOwners(botFilesNote({ bot_id }));
+
+            expect(owners).toEqual([String(bot_id)]);
+        });
+
+        test(`coordinator note names itself as bot ${bot_id}`, () => {
+            const note = coordinatorReplyNote({ bot_id });
+
+            expect(note).toContain(`[bot:${bot_id}]`);
+            expect(note).not.toContain("[bot:3]");
+        });
+    }
+
+    test("a note that already names the running bot is unchanged by its id", () => {
+        expect(botFilesNote({ bot_id: 5 })).toContain("[folder:bot:5:reports]");
+    });
+
+    test("the computer files note keeps naming the computer it was given", () => {
+        expect(ComputerFilesNote({ computer_id: 8 })).toContain("[folder:computer:8:seo/coderank/raw]");
+    });
+
+    test("notes with nothing bot-specific carry no ref example", () => {
+        expect(TasksNote).not.toContain("[folder:bot:");
+        expect(TasksNote).not.toContain("[bot:");
+    });
+});