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* fix(context): stamp AgentMemory in aware UTC, not mixed naive conventions MemoryItem timestamps had two producers with different naive conventions: store() defaulted to datetime.now() (naive LOCAL) while from_dict fell back to datetime.utcnow() (naive UTC). _timestamp_comparison_key interprets every naive stamp as LOCAL time, so on any host off UTC the two producers disagree by the host's offset — a UTC+8 host pushed freshly stored memories 8 hours outside every start_date/end_date window, and cleanup_old_memories aged them wrong by the same amount. All three producers now stamp datetime.now(timezone.utc): - store() default and the from_dict fallbacks stop introducing naive values; - the cleanup cutoff compares against an aware instant instead of a naive local one; - legacy naive stamps keep their documented local-time meaning through the comparison key, which is deliberately unchanged and now pinned by test. Seven regression tests cover the producer contract, the naive-as-local comparison semantics (so the key cannot silently flip to naive-as-UTC), the isoformat round-trip, and end-to-end date-range filtering with UTC boundaries on hosts in any timezone. * test(context): rename add() references to store() in timestamp test --------- Co-authored-by: Sameer Kadam <sskadam6305@gmail.com> Co-authored-by: Sameer Kadam <sameerkadam@Mac.lan>