nx_ad_feedback.nx

nx_ad_feedback.nx -- LIB: the GREAT/OK/BAD audience feedback for the performance ad engine (ADS-013, CALLOUT-004). Completes the honest-aggregate-measurement trio: impressions (ADS-019), conversions (ADS-018), and now SENTIMENT -- all aggregate, k-anon-floored, never per-visitor. Extends the ADS-004 placement: a polite ONE-TAP poll (no popup wall, once per visit) whose only server-side residue is an AGGREGATE rollup. THE PRIVACY PROMISE, MADE LOAD-BEARING (spec sec5): a visitor's tap may arrive with a transient session token, but the ONLY thing persisted is counts (great/ok/bad/n). `af_persist_record` has no parameter for an identifier -- the persisted record CANNOT carry one by construction. The gate proves it on the real on-disk bytes: identifiable input in, scrubbed aggregate record out. Reuses nx_ad_serve (clean first-party emit, HTML-escape, zero-third-party-JS) + nx_kanon (the k-anon release floor) -- DRY (rule 15). license_tier: ORIGINAL