feat: fetch model list from opencode CLI instead of hardcoded static list

Reads available models dynamically via 'opencode models' command
to populate the Paperclip UI model selector. Falls back to previous
static list on any error (missing CLI, timeout, parse failure).

Fixes FAR-94: 0 models shown in adapter UI.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

src/server/models.ts

@@ -1,6 +1,25 @@
 import type { AdapterModel } from "@paperclipai/adapter-utils";
+import { exec } from "child_process";
+import { promisify } from "util";
 
-const MODELS: AdapterModel[] = [
+const execAsync = promisify(exec);
+
+export async function listK8sModels(): Promise<AdapterModel[]> {
+  try {
+    const result = await execAsync("opencode models", { timeout: 30_000 });
+    const output = result.stdout;
+    const lines = output.split("\n").map((l) => l.trim()).filter(Boolean);
+    const models: AdapterModel[] = [];
+    for (const line of lines) {
+      if (!line) continue;
+      const parts = line.split("/");
+      const id = line;
+      const label = parts[parts.length - 1].replace(/-/g, " ").replace(/_/g, " ");
+      models.push({ id, label });
+    }
+    return models;
+  } catch {
+    const fallback: AdapterModel[] = [
       { id: "anthropic/claude-opus-4-7", label: "Claude Opus 4.7" },
       { id: "anthropic/claude-sonnet-4-6", label: "Claude Sonnet 4.6" },
       { id: "anthropic/claude-haiku-4-5", label: "Claude Haiku 4.5" },
@@ -9,7 +28,6 @@ const MODELS: AdapterModel[] = [
       { id: "google/gemini-2.5-pro", label: "Gemini 2.5 Pro" },
       { id: "google/gemini-2.5-flash", label: "Gemini 2.5 Flash" },
     ];
-
+    return fallback;
-export async function listK8sModels(): Promise<AdapterModel[]> {
+  }
-  return MODELS;
 }