The /setup wizard saves apiKey and baseUrl to ~/.claw/settings.json,
but the API client constructors (OpenAiCompatClient::from_env,
AnthropicClient::from_env) only read environment variables. This caused
saved provider settings to be silently ignored — you'd run /setup,
set a custom URL and API key, and the runtime would still try to use
the default endpoint.
Now AnthropicRuntimeClient::new() calls inject_config_as_env_fallbacks()
before constructing the API client. This function loads the config file's
provider settings and sets the corresponding env vars (OPENAI_API_KEY,
OPENAI_BASE_URL, etc.) only when they aren't already set — preserving
the 3-tier resolution order: env var > .env file > stored config.
This is a process-level env injection (set_var), so it only affects
the current claw process and its children, not the parent shell.
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