KIV: 1M token context window on a RTX 4070 (12GB VRAM), no retraining, drop-in HuggingFace cache replacement - Works with any model that uses DynamicCache [P]

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Been working on this for a bit and figured it was ready to share. KIV (K-Indexed V Materialization) is a middleware layer that replaces the standard KV cache in HuggingFace transformers with a tiered retrieval system. The short version: it keeps recent tokens exact in VRAM, moves old K/V to system RAM, and uses K vectors as a search index to pull back only the ~256 most relevant V entries per decode step. Results on a 4070 12GB with Gemma 4 E2B (4-bit): 1M tokens, 12MB KIV VRAM overhead, ~6.5...