bridge_provenance answers which source a field came from; it does not answer what happened on the wire. 1p (the SIAX egress measurement point) adds the robots decision + sha256 of the robots.txt it was read from, body_sha256 per fetch, and blocked_soft detection — HTTP 200 whose body is a block page, which otherwise gets scored as corroborating data. Consistent with CLAUDE.md §1: a measurement point, not a bypass. Documentation only; not in use, no worker routes through it. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>