nx_temporal_index.nx

nx_temporal_index.nx -- LIB: the (host,path)->[(date,capture)] temporal index = the "browse day-by-day" backbone. Given parallel capture arrays (keys = host+path string pointers, dates = YYYYMMDD ints), ti_query returns the capture AS IT EXISTED on a target date: the most-recent capture at-or-before the target (the Wayback "as-of" semantics), else the earliest available capture for that key. Exact key match (no prefix bleed). Pure/in-memory for this gate; seg_store persistence + WARC-Date(ISO8601)->YYYYMMDD parsing + R2 record-feed compose in a follow-on. license_tier: ORIGINAL