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- ProxyEntry: tracks proxy state, failures, and recovery - ProxyPoolConfig: YAML configuration model - ProxyPool: manages multiple proxies with round-robin rotation - from_yaml(): load from ~/.kb_proxies.yaml - from_env_fallback(): backward compatible env var loading - get_next_proxy(): round-robin with lazy recovery check Implements PROXY-01 (multi-proxy config) and PROXY-02 (rotation) Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>