🗓️ Deliverables Checklist

Status	Component	Description	Notes
$\square$	`Node` Struct	Defines key/value pairs and necessary pointers (`Prev`, `Next`).	Core data structure.
$\square$	`LRUCache` Struct	Holds the map, head, tail, capacity, and mutex.	Container logic.
$\square$	`NewLRUCache()`	Constructor function.	Initialization logic.
$\square$	`moveToHead(node *Node)`	Helper method for list re-linking.	Essential $O(1)$ operation.
$\square$	`Get(key KeyType) (ValueType, bool)`	Retrieves item and updates usage order.	Includes mutex lock.
$\square$	`Put(key KeyType, value ValueType)`	Inserts/updates item, handles eviction when capacity is exceeded.	Includes mutex lock & size check.
$\square$	Unit Tests (Go testing package)	Comprehensive tests covering all edge cases and concurrency.	Verification of correctness.