Add the harness, envs, per-bot models and chat attachments

- Harness: providers, model catalog synced hourly, automatic free picks,
  cooldowns, tool loop with context trimming, MCP computer tools
- Bots queue runs replies and tasks through the harness; jobs wait
  (attempt refunded) while every model is resting
- Envs: Settings > Environment, scoped general/workspace/computer,
  written to computers and redacted from tool output
- Models: Settings > Models, per-harness provider select defaulting to
  OpenRouter, and a models modal on each bot's chat (the coordinator's
  edits the defaults)
- Chat: thinking row while a reply runs, file attachments (upload,
  paste, drop) that replies read as images, audio and document text
- Fix media uploads failing after a user's first file, and private
  files being served from the public media path

Co-Authored-By: Claude Opus 5.5 <[email protected]>

src/dict/bot-queue-dict.ts

@@ -9,3 +9,25 @@ export const BotJobCancelledError = "Cancelled";
  * silent past the lock timeout on its last attempt.
  */
 export const BotJobLockTimedOutError = "Lock timed out";
+
+/**
+ * What a queued job is. A `task` is long-running work with a row in the
+ * working-on panel; a `reply` answers the user's latest messages in chat.
+ */
+export const BotJobKinds = [
+    { title: "Task", value: "task" },
+    { title: "Reply", value: "reply" },
+] as const;
+
+export type BotJobKind = (typeof BotJobKinds)[number]["value"];
+
+/**
+ * A reply job's title, and the bot's status line while it runs. The chat
+ * shows a thinking row while a bot has it.
+ */
+export const BotReplyJobTitle = "Thinking";
+
+/**
+ * The bot's status line while its job waits for a rate-limited model.
+ */
+export const BotWaitingStatusLine = "Waiting for a free model";