01Async HTTP client factory with configurable timeouts, retries, and default headers.
02Modular core for configuration, spec loading, authentication, HTTP client creation, and server orchestration.
03Configurable runtime merging command-line flags, environment variables, and config files.
04Extensible authentication with built-in support for bearer tokens, API keys, custom headers, and basic auth.
05Extensible defaults for base URLs, headers, and authentication schemes without modifying core runtime.
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