feat(onboard): add OpenCode Zen as model provider

src/commands/opencode-zen-model-default.ts

@@ -0,0 +1,45 @@
+import type { ClawdbotConfig } from "../config/config.js";
+import type { AgentModelListConfig } from "../config/types.js";
+
+export const OPENCODE_ZEN_DEFAULT_MODEL = "opencode-zen/claude-opus-4-5";
+
+function resolvePrimaryModel(
+  model?: AgentModelListConfig | string,
+): string | undefined {
+  if (typeof model === "string") return model;
+  if (model && typeof model === "object" && typeof model.primary === "string") {
+    return model.primary;
+  }
+  return undefined;
+}
+
+export function applyOpencodeZenModelDefault(cfg: ClawdbotConfig): {
+  next: ClawdbotConfig;
+  changed: boolean;
+} {
+  const current = resolvePrimaryModel(cfg.agents?.defaults?.model)?.trim();
+  if (current === OPENCODE_ZEN_DEFAULT_MODEL) {
+    return { next: cfg, changed: false };
+  }
+
+  return {
+    next: {
+      ...cfg,
+      agents: {
+        ...cfg.agents,
+        defaults: {
+          ...cfg.agents?.defaults,
+          model:
+            cfg.agents?.defaults?.model &&
+            typeof cfg.agents.defaults.model === "object"
+              ? {
+                  ...cfg.agents.defaults.model,
+                  primary: OPENCODE_ZEN_DEFAULT_MODEL,
+                }
+              : { primary: OPENCODE_ZEN_DEFAULT_MODEL },
+        },
+      },
+    },
+    changed: true,
+  };
+}