Adds per-agent model configuration: ALLOWED_MODELS allowlist in
src/config/models.ts, model field in AgentYamlSchema (Zod default:
claude-sonnet-4-6), --model flag forwarded to the Claude CLI in
runner.ts, and a StringSelectMenuBuilder step in the /new-agent
command flow. Three unit tests cover model passthrough, default
fallback, and invalid-model rejection.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
