nx_ad_reach.nx

nx_ad_reach.nx -- LIB (PURE): HONEST BILLABLE REACH. The ONLY impression count an advertiser is charged for = impressions that are BOTH genuinely SEEN (viewable, MRC >=50%/>=1s) AND VALID (not bot / invalid traffic). This unifies the operator's two laws in the MONEY path: "no fake impressions like Google/others" (viewability) + "filter the bot/useless traffic for clients" (IVT). Composes nx_ad_view + nx_ad_botfilter (DRY rule 15); both are aggregate, so this can never become per-user. PRIVACY BY CONSTRUCTION: combined bucket = [viewed, dwell_ms, ua_class, src_class, js_class, n] -- all AGGREGATE class codes + a count; NO visitor id / IP / fingerprint. license_tier: ORIGINAL