fix(scope): strictScope 硬过滤补到 entity: / attr: 前缀检索（显式他者 scope 曾被绕过）

[modusensus]

Closes #357

现象

memory_search 带 entity: / attr: 前缀时会绕过 strictScope 硬过滤：显式标注为他人
scope 的记忆，普通检索查不到，换这两个前缀就能原样读出来——而且是满分返回（连 A2 的
×0.5 降权都没有）。

暴露面：scopeEnabled + strictScope + entitySearchEnabled 三者同开（默认全关）。而
entity: 正是 #24 图谱线在推的语法，这条路的使用面只会越来越大。

复现（修复前，实跑输出）

const store = createStore(":memory:");
const service = createService({ store, mirror: null,
  config: { scopeEnabled: true, strictScope: true, entitySearchEnabled: true } });

const row = store.save({ type: "preference", title: "别人的机密预算", content: "机密预算内容",
  agent_scope: "other", agent_scope_source: "explicit" });
const entity = store.createEntity({ name: "阿尔托", type: "person" });
store.saveAttr({ entity_id: entity.id, attr_key: "国籍", attr_value: "芬兰", memory_id: row.id });

const me = { agent_scope: "me", workspace_scope: null };
await service.searchMemories("机密预算", { mode: "keyword", scope: me }); // 0 条 ✅
await service.searchMemories("entity:阿尔托", { scope: me });              // 1 条 ❌
await service.searchMemories("attr:国籍=芬兰", { scope: me });             // 1 条 ❌

根因

src/service.js 的 searchMemories 有两处早返回：

• 路由块：entity: / attr: 前缀在函数入口直接 return searchByEntity(...) /
  searchByAttr(...)；
• 融合池：strictScope 过滤写在函数后半段——早返回的路根本走不到。

而 searchByEntity / searchByAttr 的签名只解构 { topK }，调用方传进来的 options
（里面就带着 scope）被丢掉。

顺带两处同源现象，本批一并收掉：

1. 越权命中会反馈到热度 / 边权：两个函数都无条件调用 touchRecalled(hits)——heat 或
   被动确认开启时，一次越权检索会给本不该看到的行刷回温时钟、bump 关联边。
2. A2 软加权缺失：SCOPE_FOREIGN_PENALTY 只在融合 / 注入路径生效，这两条路他 scope
   行是满分返回的。本批只补硬过滤，不动排序语义——要不要把 A2 也补上按 实验分享：scope 与蒸馏的两份体检——strictScope 考卷 + 压缩悬崖保真 #339 的口径
   另行决定。

修法

scope 闸抽成 gateByScope() 单一实现，融合池与两条前缀路三处共用——三处各写一份判断
只会让下一个新增通路再漏一次（同 #349 把阈值口径收进 activeStoreSize() 的理由）。

闸门放在 touchRecalled 之前：只加在「返回前」的话，出局的行仍会先被摸一遍。

strictScope 关（默认）时 gateByScope 原样返回，行为逐字节不变。

测试

三条，都带「反向对照」以免假绿：

• searchMemories entity: prefix honours the strictScope hard filter —— 显式他者出局、
  auto / 存量他者按 A2 保留，并断言原主人仍看得见显式那条（否则可能是「谁都搜不到」）；
• searchMemories attr: prefix honours the strictScope hard filter —— 同上；
• 次序锁：出局行不被回温、不 bump 关联边，并断言可见行确实被触达（正向对照）。

写第二条时踩了个坑值得记一句：属性行有时间轴语义，同一 (实体, 属性键) 后写的一条会
把前一条作废——所以给多条记忆挂同一个实体时属性键必须各不相同，否则只有最后一条会被链接
上，测试会假绿。这一点写进测试注释了。

验证

• 全量 npm test：1522 tests / 1521 pass / 0 fail / 1 skip
• check-sync：src ↔ lib 一致（52 文件）
• 变异检验（三条，确认用例不是空转）：

变异	变红的用例
实体路去掉闸门	entity: 过滤 ＋ 次序锁
属性路去掉闸门	attr: 过滤
实体路把闸门挪到 touchRecalled 之后	次序锁（只有它红——说明这条锁不是冗余的）

顺带

双 README 的测试数停在 1497 的漂移（#354 / #355 合并遗留）已由 #356 刷到 1519，本批再加
3 条用例后统一刷到 1522（6 处），仍走 npm run badge:sync。

本分支已 rebase 到 #356 合入后的 main：两处 CHANGELOG 撞车按上次 #354/#355 的处置并入同一个
## 🐛 修复 段，不新开一节。

关联

• [Feature Request] 按 agent 与 workspace 隔离记忆：专属记忆 + 全局共享记忆并存 #17（scope 四象限 / A3 strictScope 的出处）
• 实验分享：scope 与蒸馏的两份体检——strictScope 考卷 + 压缩悬崖保真 #339（A2 软加权补齐注入通道——同类的「某条通道漏了 scope」）
• 图谱增强：把图从展示变成检索信号（discussion #22 追踪） #24（图谱线在推 entity:，这条路的使用面会越来越大）

Summary by CodeRabbit

• 功能改进
  • 实体、属性及常规记忆搜索均支持严格范围过滤。过滤在结果数量截取前执行，不可见记忆不会更新访问状态或关联权重；关闭严格过滤或未提供范围时，行为保持不变。
• 文档
  • README 中展示的测试通过数更新为 1523。

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📝 Walkthrough

Walkthrough

实体、属性和常规记忆搜索现共用 gateByScope。启用 strictScope 且提供 scope 时，搜索会过滤不可见候选，并在过滤后触达记忆。新增回归测试，并将 README 中的测试数更新为 1523。

Changes

strictScope 搜索过滤

Layer / File(s)	Summary
统一 scope 过滤与搜索路径 dsh-mneme/src/service.js, dsh-mneme/lib/service.js, dsh-mneme/test/scope-strict.test.js	新增 gateByScope，并为 searchByEntity 和 searchByAttr 增加可选 scope 参数。前缀搜索和常规融合搜索均使用该过滤器。前缀搜索在截取 topK 和触达记忆前过滤候选；实体关键词候选窗口扩大到 topK * 2。测试覆盖 scope 可见性、触达副作用及 topK=1 场景。
修复记录与测试数更新 dsh-mneme/CHANGELOG.md, README.md, dsh-mneme/README.md	新增 strictScope 修复记录。中文和英文 README 中的测试数从 1519 更新为 1523。

Priority: ⬆️ High

Estimated code review effort: 3 (Moderate) | ~20 minutes

Change: Bug fix · Severity of issue fixed: Medium

Merge Risk: ⚪ Minimal · up to 2e72f

The strict-scope prefix fix is ready to merge after normal checks; no actionable merge-blocking issue was found.

Security Architecture Review

Security architecture risk: 🔵 Low · up to dc584

The change strengthens scoped memory searches by filtering unauthorized matches before returning or updating them. No newly introduced security issue was established. Confidence is limited by incomplete baseline and deployment evidence, and callers that omit scope remain outside this protection.

Retained concerns
No architecture-level concerns identified.

Security review details

Security Blast Radius

• inferred — The affected confidentiality and integrity scope is memory records and their linked recall-state or graph-edge updates within the service's store. Authorization distinguishes agent and workspace labels; the inspected evidence does not establish independent tenant, database, or deployment isolation.

Security Findings and Attack Paths

• observed — The supplied prior attack path was a caller selecting entity: or attr: syntax to reach records without the regular-search scope check. At head, those routes apply the shared visibility check before return and recall updates when strictScope and scope are present. This is a repaired path described by the change evidence, not a newly introduced Security finding.

Trust Boundaries and Controls

• observed — Unavailable tool-session identity yields a truthy scope object with null dimensions, so explicitly scoped records are rejected. By contrast, both inspected HTTP search callers omit scope and therefore do not activate this gate. Scope enforcement is consequently caller-dependent, not a universal authorization boundary for every search entrypoint.
• inferred — Unscoped HTTP compatibility appears to predate this PR: the declared changed surface does not include the HTTP callers, and the service explicitly documents compatibility for callers that omit scope. This is not retained as a PR-introduced concern, but the intended base source and deployment authority of those endpoints remain unverified.

Resilience and Maintainability Implications

• inferred — Prefix filtering and recall mutation execute synchronously without an intervening await. Repeated calls still perform feedback updates, but excluded candidates are never passed to touchRecalled on these routes. Partial mutation failures do not fall back to returning rejected candidates. Concurrent ownership changes during asynchronous regular search were not independently established against the intended baseline.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	标题准确概括了主要变更：为 entity: 和 attr: 前缀检索补充 strictScope 硬过滤，并指出此前存在的绕过问题。
Linked Issues check	✅ Passed	[#357] 要求 strictScope 在 entity: 与 attr: 路径中过滤显式他者记忆，并在过滤后触达结果。此前已审查的实现和测试覆盖两条路径、原主人可见性及触达顺序。本次增量将两条路径改为先 gateByScope()、再截取 topK；新增 topK=1 测试确认被过滤候选不会占据结果名额。src 与 lib 的增量实现一致。改动未增加 #357 明确留给后续决策的 A2 排序…
Out of Scope Changes check	✅ Passed	未发现与 [#357] 无关的改动。topK 顺序修正和回归测试直接支持作用域过滤要求；src/lib 同步、CHANGELOG 记录及 README 测试数更新均与本次修复或其验证结果相关。
Docstring Coverage	✅ Passed	Docstring coverage is 85.71% which is sufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 14 functions across 3 files. (3 skipped: 3 …

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Inline comments:
Review comments at @dsh-mneme/src/service.js:
- Line 404: 在实体和属性搜索流程中调整候选处理顺序：先用 gateByScope 过滤 hits，再截取
topK，确保被拒绝的候选不会挤掉可见结果。实体关键词查询也需在 scope 过滤前移除 limit: topK 限制或扩大候选范围，避免候选提前耗尽。

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