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Adds ImageGenerationProvider ABC with shared __init__, _http_post(), and _require_images(). Introduces _IMAGE_GEN_PROVIDERS registry with register/get/image_gen_provider_configs() helpers. Four existing providers (OpenRouter, AIHubMix, Gemini, MiniMax) now inherit from the base class and self-register. Adding a new provider only requires writing one class + one registration line. Eliminates if/else chains in the tool dispatch and hardcoded provider config dicts in commands.py (3 sites) and nanobot.py (1 site). Fixes the agent CLI command missing image_generation_provider_configs entirely. Also simplifies test monkeypatch targets to patch the registry lookup.