- audit.rs → audit/mod.rs(959→812行) + 新建 audit/reason.rs(167行) - 抽离 reason helper: resolve_project_label/resolve_task_label/build_approval_reason(3 fn自成闭包, pub(super)) - re-export 调用方零变更(commands::ai::audit::* 路径透明, 4处调用方+mod re-export核验) - F-09 batch2 per_conv 保留(本批只搬 reason helper, conv_id路由不动) 主代兜底: cargo check --workspace 0 + test 98 + grep mod reason/use印证 strategy: 单批1-2文件原子; audit/mod.rs余812行(后续批restore/audit_finalize/find_cached)