In-memory cache implementation for development and testing.

Features:
- Thread-safe operations using Clojure atoms
- TTL support with automatic expiration
- LRU eviction policy
- Statistics tracking
- Pattern matching
- Namespace support

Suitable for:
- Local development without Redis
- Fast unit testing
- CI/CD pipelines
- Single-process applications

NOT suitable for:
- Distributed systems (not shared across processes)
- Production use (no persistence)
- High-memory workloads (limited by JVM heap)

Redis-backed distributed cache implementation.

Features:
- Distributed caching across multiple processes
- Automatic TTL and expiration
- Atomic operations (INCR, DECR, SETNX)
- Pattern matching with SCAN
- Namespace support
- Connection pooling

Suitable for:
- Production deployments
- Distributed systems
- High-availability applications
- Microservices architecture

Redis Data Structures Used:
- Strings: For cache values (Nippy serialized, stored as binary)
- TTL: Built-in Redis expiration
- Atomic ops: INCR, DECR, SETNX, etc.