duplication.cross-file

heuristicunmeasuredseverity: medium

A behavioral claim we believe and have not measured. Labeled unmeasured in every reporter line, excluded from the chaff score, and never fails a build by default.

Claim

Two co-loading resident files contain near-duplicate sections (normalized 5-gram shingle similarity ≥ 0.8): the same instruction paid for twice on every turn.

Rationale

Duplicated doctrine drifts: one copy gets edited, the other keeps asserting the old rule. Believed harmful; not yet measured (SPEC §6).

Fix

Keep one canonical statement and delete the copy, or replace it with a one-line pointer.

chaff explain duplication.cross-file: same registry, offline, from the CLI.