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]>

package.json

@@ -35,6 +35,7 @@
         "typescript": "^7.0.2"
     },
     "dependencies": {
+        "@modelcontextprotocol/sdk": "^1.32.1",
         "@moduletrace/bun-sqlite": "^1.3.0",
         "@moduletrace/bunext": "^1.3.3",
         "@moduletrace/twui": "^0.1.1",
@@ -43,7 +44,7 @@
         "gray-matter": "^4.0.3",
         "html-to-react": "^1.7.0",
         "lodash": "^4.18.1",
-        "lucide-react": "^1.31.0",
+        "lucide-react": "^1.59.0",
         "mammoth": "^1.12.1",
         "mdx": "^0.3.1",
         "next-mdx-remote": "^6.0.0",