Zero-Shot Semantic Cache Implementation

Implement a semantic cache layer for LLM responses.

Cache Requirements:
{{cache_specifications}}

Similarity Threshold:
{{similarity_threshold}}

Eviction Policy:
{{eviction_rules}}

Design and implement:
1. Embedding-based cache key generation
2. Similarity search for cache lookup
3. Cache entry storage with metadata
4. TTL and invalidation logic
5. Cache warming strategy
6. Metrics and monitoring hooks