feat: add RAG search via Hanzo Cloud (search-docs + chat-docs) #351

Job	Run time
🔨 Verify Functions Are Implemented	19s
🎯 Code Quality Check	46s
✅ ALL Tests Must Pass (3.12)	2m 2s
🧪 Anti-Stub Tests	59s
🚫 Block TODO/STUB/FAKE Code	17s
🚀 Deployment Gate	-1s
📦 Publish to PyPI	-1s
	4m 21s

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