Add !ai Matrix command for querying other models via OpenRouter

agent/src/openrouter.js

@@ -0,0 +1,33 @@
+const OPENROUTER_API_KEY = process.env.OPENROUTER_API_KEY;
+const DEFAULT_MODEL = process.env.OPENROUTER_DEFAULT_MODEL || "openai/gpt-4o-mini";
+
+export async function askOpenRouter(model, prompt) {
+  if (!OPENROUTER_API_KEY) {
+    throw new Error("OPENROUTER_API_KEY is not set");
+  }
+
+  const res = await fetch("https://openrouter.ai/api/v1/chat/completions", {
+    method: "POST",
+    headers: {
+      Authorization: `Bearer ${OPENROUTER_API_KEY}`,
+      "Content-Type": "application/json",
+    },
+    body: JSON.stringify({
+      model: model || DEFAULT_MODEL,
+      messages: [{ role: "user", content: prompt }],
+    }),
+  });
+
+  if (!res.ok) {
+    throw new Error(`OpenRouter request failed: ${res.status} ${await res.text()}`);
+  }
+
+  const data = await res.json();
+  const content = data.choices?.[0]?.message?.content;
+  if (!content) {
+    throw new Error(`OpenRouter returned no content: ${JSON.stringify(data)}`);
+  }
+  return content;
+}
+
+export { DEFAULT_MODEL };