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/harness/audio/looks-like-missing-audio.test.ts

@@ -0,0 +1,27 @@
+import { describe, expect, test } from "bun:test";
+import looksLikeMissingAudio from "./looks-like-missing-audio";
+
+describe("looksLikeMissingAudio", () => {
+    test("spots a model asking for the audio it never got", () => {
+        for (const text of [
+            "Please provide the audio file you’d like transcribed.",
+            "I’m sorry, but I can’t transcribe without the audio.",
+            "I cannot hear any audio in your message.",
+            "There is no audio attached.",
+            "I didn't receive any audio.",
+        ]) {
+            expect(looksLikeMissingAudio({ text })).toBe(true);
+        }
+    });
+
+    test("leaves real transcripts alone", () => {
+        expect(looksLikeMissingAudio({ text: "Hello from cobble." })).toBe(
+            false,
+        );
+        expect(
+            looksLikeMissingAudio({
+                text: `Can you send the audio report to finance? ${"And then more. ".repeat(30)}`,
+            }),
+        ).toBe(false);
+    });
+});