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/functions/backend/db/bots/grab-bot-prompt.ts

@@ -19,10 +19,10 @@ type Params = {
 };
 
 /**
- * The full prompt for one of the user's bots (`composeBotPrompt`): its
- * core instructions, the install-wide appendix, its memory, what it
- * remembers about this user, and in a workspace that workspace's context
- * and what the bot has for it.
+ * The full prompt for one of the user's bots (`composeBotPrompt`): who it
+ * is (its name and id), its core instructions, the install-wide appendix,
+ * its memory, what it remembers about this user, and in a workspace that
+ * workspace's context and what the bot has for it.
  */
 export default async function grabBotPrompt({ bot_id, user_id, workspace_id }: Params) {
     const bot = await grabUserBot({ bot_id, user_id });
@@ -40,6 +40,7 @@ export default async function grabBotPrompt({ bot_id, user_id, workspace_id }: P
     }
 
     return composeBotPrompt({
+        bot: { id: bot.id, name: bot.name, kind: bot.kind, role: bot.role },
         system_prompt: bot.system_prompt,
         appendix: await grabSystemPromptAppend(),
         memory: bot.memory,