- add reusable `LruCache` utility with bounded eviction - replace keybinding AST cache clear-all behavior with true LRU lookups - add unit tests for eviction, recency updates, and capacity validation
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- add reusable `LruCache` utility with bounded eviction - replace keybinding AST cache clear-all behavior with true LRU lookups - add unit tests for eviction, recency updates, and capacity validation