Kyros is OS-level memory infrastructure for AI agents. Instead of re-sending full chat history on every call, Kyros pages, scores, and evicts memory like an operating system manages RAM using real decay curves, not just a vector DB with a TTL. Open-source core, 5 framework integrations (LangChain/CrewAI/AutoGen/LlamaIndex/Semantic Kernel), Merkle-signed writes for auditability. Built by backend engineers tired of watching context bloat eat compute budgets.