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/tools/run-tool-call.ts

@@ -0,0 +1,61 @@
+import { z } from "zod";
+import { AppData } from "@/src/data/app-data";
+import HarnessError from "../harness-error";
+import type { HarnessTool, HarnessToolCall } from "../types";
+
+type Params = {
+    call: HarnessToolCall;
+    tools: HarnessTool[];
+    signal: AbortSignal;
+};
+
+/**
+ * Runs one tool call and returns the text the model gets back. Unknown
+ * tools, bad arguments and tool failures come back as `Error: ...` so the
+ * model can correct itself; only cancellation is thrown.
+ */
+export default async function runToolCall({ call, tools, signal }: Params) {
+    const tool = tools.find((t) => t.name == call.name);
+
+    if (!tool) {
+        return `Error: There is no tool called "${call.name}". Available: ${tools.map((t) => t.name).join(", ") || "none"}.`;
+    }
+
+    let raw: unknown;
+
+    try {
+        raw = call.arguments.trim() ? JSON.parse(call.arguments) : {};
+    } catch {
+        return `Error: The arguments for ${call.name} weren't valid JSON. Send a JSON object.`;
+    }
+
+    if (!raw || typeof raw != "object" || Array.isArray(raw)) {
+        return `Error: The arguments for ${call.name} must be a JSON object.`;
+    }
+
+    const parsed = tool.schema?.safeParse(raw);
+
+    if (parsed && !parsed.success) {
+        return `Error: Wrong arguments for ${call.name}.\n${z.prettifyError(parsed.error)}`;
+    }
+
+    try {
+        return truncate({
+            text: await tool.run({ args: parsed ? parsed.data : raw, signal }),
+        });
+    } catch (error: unknown) {
+        if (signal.aborted) {
+            throw new HarnessError({ message: `Cancelled.`, code: "aborted" });
+        }
+
+        return `Error: ${error instanceof Error ? error.message : String(error)}`;
+    }
+}
+
+function truncate({ text }: { text: string }) {
+    const max = AppData.HarnessToolResultMaxChars;
+
+    if (text.length <= max) return text;
+
+    return `${text.slice(0, max)}\n[Cut: ${text.length - max} more characters.]`;
+}