feat(graph): 被动确认 Passive Confirmation（issue #24 块4）

[modusensus]

背景

issue #24（v0.8 图谱增强）块4 被动确认：人工「认可/删除/忽略」三选一门槛太高 → 收敛为「例外管理」——把确认缝进 touch 门控，正常触达视为被动确认。

改动

• store.getRelationsByMemory：按记忆反查关联边（复用 [Feature] 图召回轴：实体表参与检索融合（C 批次接线，opt-in） #219 已建的 idx_relations_memory 索引）
• service.touchRecalled：heatOn 与 passive 拆成独立闸门——graphPassiveConfirm 开时即使 heatEnabled=false 也照常 bump（touchLastAccess 的热度消费仍随 heat 关停，既有语义不变）
• 触达 = 被动确认：命中记忆的关联边 bumpRelationWeight 抬一格（只加不减、封顶 1.0，见 feat(graph): 边权重演化 Weight Evolution（issue #24 块2） #342）
• config.graphPassiveConfirm（默认 false = 零行为变化），全走 feature_flags、lightMode 强制关闭

设计取舍

• 「正常触达视为被动确认，仅异常路径暴露给用户复核」——本块落地确认的记录侧，复核 UI 留后续块
• 自激回路（点击→边权变→结果变→再点击）由 bump 封顶 1.0 天然遏制，与 feat(heat): 广义指数衰减 exp(-λΔt^β) + 注入排序热度乘数（#218） #234/feat(graph): 边权重演化 Weight Evolution（issue #24 块2） #342 对自激的顾虑同源
• 依赖 feat(graph): 边权重演化 Weight Evolution（issue #24 块2） #342（bumpRelationWeight / weight 列 / graphWeightDelta），base 指向 feat/graph-weight-evolution

测试

• test/graph-passive-confirm.test.js（新）：默认关零变化 / 开启 bump / heat 关但 passive 开仍 bump / 封顶 / 无关联边降级
• heat/weight 回归绿

状态

⚠️ base = feat/graph-weight-evolution（#342），需 #342 先合。块1 #341、块2 #342、块3 #343 已提；四块至此全部落地。

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