feat: add Claude Code model selection to setup

packages/context/src/llm/claude-code-runtime.test.ts

@@ -447,4 +447,18 @@ describe('ClaudeCodeKtxLlmRuntime', () => {
       env: expect.not.objectContaining({ ANTHROPIC_API_KEY: 'sk-ant-test' }),
     });
   });
+
+  it('reports unsupported Claude Code models without framing them as auth failures', async () => {
+    await expect(
+      runClaudeCodeAuthProbe({
+        projectDir: '/tmp/project',
+        model: 'gpt-5',
+        query: vi.fn(),
+        env: {},
+      }),
+    ).resolves.toEqual({
+      ok: false,
+      message: 'Unsupported Claude Code model "gpt-5". Use sonnet, opus, haiku, or a claude-* model id.',
+    });
+  });
 });

packages/context/src/llm/claude-code-runtime.ts

@@ -288,10 +288,20 @@ export async function runClaudeCodeAuthProbe(input: {
   query?: QueryFn;
   env?: NodeJS.ProcessEnv;
 }): Promise<{ ok: true } | { ok: false; message: string }> {
+  let model: string;
+  try {
+    model = resolveClaudeCodeModel(input.model);
+  } catch (error) {
+    return {
+      ok: false,
+      message: error instanceof Error ? error.message : String(error),
+    };
+  }
+
   try {
     const options = baseOptions({
       projectDir: input.projectDir,
-      model: resolveClaudeCodeModel(input.model),
+      model,
       env: input.env,
       maxTurns: 1,
     });