Feat/memory eviction advanced#15
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- extend EvictionPolicy with allkeys-lfu, volatile-lfu, allkeys-ahe, volatile-ahe - add Morris probabilistic counter and minute-granularity decay helpers - add AdaptiveHybridState feedback loop tuning alpha via hit ratio - thread lfu_counter / lfu_decay_minute through ValueEntry + Candidate - record keyspace hits/misses in get/mget/exists for AHE feedback - unit test LFU picks, AHE TTL penalty, Morris bounds, decay math
… INFO - accept allkeys-lfu/volatile-lfu/allkeys-ahe/volatile-ahe in CLI and config.file errors - document new policies in ferrum.conf.example - INFO memory now reports ahe_alpha + ahe_last_hit_ratio - INFO stats section exposes keyspace_hits / keyspace_misses
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