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/catalog/guess-model-modalities.test.ts

@@ -0,0 +1,41 @@
+import { describe, expect, test } from "bun:test";
+import guessModelModalities from "./guess-model-modalities";
+
+const outputs = (slug: string) =>
+    guessModelModalities({ slug }).output_modalities;
+
+describe("guessModelModalities", () => {
+    test("spots speech, transcription, image and embedding models", () => {
+        expect(outputs("whisper-large-v3")).toEqual(["transcription"]);
+        expect(outputs("gpt-4o-mini-transcribe")).toEqual(["transcription"]);
+        expect(outputs("tts-1-hd")).toEqual(["speech"]);
+        expect(outputs("gpt-image-1")).toEqual(["image"]);
+        expect(outputs("dall-e-3")).toEqual(["image"]);
+        expect(outputs("text-embedding-3-small")).toEqual(["embeddings"]);
+    });
+
+    test("takes everything else for a tool-calling chat model", () => {
+        expect(guessModelModalities({ slug: "deepseek-chat" })).toEqual({
+            input_modalities: ["text"],
+            output_modalities: ["text"],
+            supports_tools: true,
+        });
+        expect(outputs("mistral-large-latest")).toEqual(["text"]);
+    });
+
+    test("knows which chat families see images", () => {
+        expect(
+            guessModelModalities({ slug: "claude-sonnet-5-5" }).input_modalities,
+        ).toEqual(["text", "image"]);
+        expect(
+            guessModelModalities({ slug: "models/gemini-3.5-flash" })
+                .input_modalities,
+        ).toEqual(["text", "image"]);
+        expect(
+            guessModelModalities({ slug: "qwen2.5-vl:7b" }).input_modalities,
+        ).toEqual(["text", "image"]);
+        expect(
+            guessModelModalities({ slug: "deepseek-r1:14b" }).input_modalities,
+        ).toEqual(["text"]);
+    });
+});