nx_ad_botfilter.nx

nx_ad_botfilter.nx -- LIB (PURE, no I/O): aggregate INVALID-TRAFFIC / bot classifier for the "Brought to you by" performance ad engine (ADS-019, CALLOUT-004). Applied BEFORE counting so HONEST billing never charges for bot traffic (nx_ad_meter ADS-007 applies it; nx_ad_conversion ADS-018 reuses it -- DRY rule 15). PRIVACY BY CONSTRUCTION: inputs are AGGREGATE CLASS-BUCKET counts only -- each bucket = (ua_class, src_class, js_class, n). No visitor id / IP / fingerprint exists in the data model, so "filter bots" can never become "track people". PURE: this lib does NO file/store I/O. Rules arrive as a parsed pair-array. The SOURCE of rules is the sovereign store (nx_ad_store -> adcfg:botrules), NOT a TSV file -- "pure Nishi ecosystem", no flat-file registries. `bf_parse_rules` turns store bytes into rules; the store read lives in nx_ad_store so this classifier stays a pure leaf. license_tier: ORIGINAL