feat: add models scan and fallbacks

src/commands/models/set.ts

@@ -0,0 +1,29 @@
+import { CONFIG_PATH_CLAWDBOT } from "../../config/config.js";
+import type { RuntimeEnv } from "../../runtime.js";
+import { buildAllowlistSet, modelKey, resolveModelTarget, updateConfig } from "./shared.js";
+
+export async function modelsSetCommand(
+  modelRaw: string,
+  runtime: RuntimeEnv,
+) {
+  const updated = await updateConfig((cfg) => {
+    const resolved = resolveModelTarget({ raw: modelRaw, cfg });
+    const allowlist = buildAllowlistSet(cfg);
+    if (allowlist.size > 0) {
+      const key = modelKey(resolved.provider, resolved.model);
+      if (!allowlist.has(key)) {
+        throw new Error(`Model ${key} is not in agent.allowedModels.`);
+      }
+    }
+    return {
+      ...cfg,
+      agent: {
+        ...cfg.agent,
+        model: `${resolved.provider}/${resolved.model}`,
+      },
+    };
+  });
+
+  runtime.log(`Updated ${CONFIG_PATH_CLAWDBOT}`);
+  runtime.log(`Default model: ${updated.agent?.model ?? modelRaw}`);
+}