Module doc gains three sections: the FWD-18 routing rule (placeholder keys never double-emit as query; structural path values are INVALID_INPUT), the FWD-19 percent trade-off (% in values always encoded; % in assembly-supplied template/base text survives verbatim — documented instead of rejected, per the ADR-066 assembly trust boundary), and the FWD-17 streaming payload contract. FWD-19 behavior pinned by a wire-level template test.