# Placeholder for source code implementation (Day 2)
#
# Files to create:
# - lib.rs (library root)
# - config.rs (CacheConfig with violations 2, 5, 7, 8, 10)
# - client.rs (CacheClient with violations 1, 4, 6, 9)
# - error.rs (error types)
#
# See plan.md Day 2 for detailed implementation guidance.
