[modusensus]

Closes #557.

背景

dream_runs 是四个 *RetentionDays 都不覆盖、也没有任何 DELETE 路径的唯一一张表：单行 input 快照体量随记忆数涨、轮数随天数涨，两个因子相乘超线性（报告库占约 43% 的页），再叠加热快照是整库副本，它同时放大库与备份两处开销。

改了什么

• 新键 dreamRunsTrimDays（opt-in 默认 0 = 不裁，升级后行为逐字节不变）。形态对齐 recallRetentionDays 一族：顶层扁平键、只从配置文件改。
• 启动期裁掉窗口外轮次的三列重载：input（可由记忆库重建）、decisions、outcome——issue 评论实测这三列占 13.26 MB 列文本的 50.1% / 30.5% / 17.8%。
• 裁列不删行（维护者拍板 3）：行、snapshot_hash、status、provider、receipt、policy_epoch、store_count 等骨架列全部保留；窗口外轮次的离线回放降级为骨架级（与 reclaim 清 input、dreamInputSummaryEnabled 的瘦身同一条口径，docs/CONFIGURATION.md 写明三处互不冲突）。
• organize 行整体豁免：它的 input 是 apply 的重放载荷、outcome 挂着 dry_run_id / applied_at 链；谓词与 clearDreamRunInputs 同一条边界。
• 启动期执行（读装配后的 cfg、失败只 warn 不挡启动）；真裁到了才出一行 info，常态零日志。

验证

• 全量 npm test：0 fail（合并最新 main 后重跑）。
• check-sync：一致。
• 新增回归 7 条：窗口外裁三列且骨架列逐列不变 / 行永不删 / organize 整体豁免 / 重跑 changes=0 / stats 与执行同口径 / 空表与无命中不抛 / 配置键默认 0 与边界 + 两处文档列出该键 + 接线锁（0 不裁、读 cfg、失败只 warn）。
• 变异自证 4 例全部变红（删 organize 豁免 / > 0 改 >= 0 / 默认改 90 / 裁剪漏 outcome）。
• 已过 euthyna 变更面审计：0 TRUE POSITIVE。

已知边界

• 键未进 settings.js 白名单（与该族现状一致，文档已注明）；要上面板需同时补 api.js 的 NESTED 表与 client.js 的面板行。
• 窗口没有「保留最近 K 轮」的下限；配得很小时，最近的 decisions.demotion 会退化为 null（骨架不受影响）。

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Codecov Report

❌ Patch coverage is 91.52542% with 5 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
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