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- STEP 节点注册表：branchAnchor（右下橙锚，拖出经分支 Modal 写 rules）+ ruleTargetCheck（分支只允许指向步骤节点）+ ruleModalHint（SpEL 求值语境）+ expandsRules/layoutUsesRules（分支边渲染与布局计入）+ validate（默认分支唯一/目标合法） - FlowDesigner：分支锚点交互（data-branch-handle-id → applyConnect via branch）+ 分支边自橙锚出发（startDy 错开主线）+ 连线抽屉表达式编辑（工作流 CONDITION 同享）+ 分支 Modal 语境提示按节点类型分派 - orchestration.ts：chainToFlow branches→rules 映射；flowToChain 移除 keepBranches 透传，镜像后端 ChainSpecs 约束导出（分支只指向步骤节点/不指自身/默认分支每步骤 至多一个/未连入主线步骤拦截） - IntegrationPage：chainBranches 透传状态移除；画布提示文案更新 浏览器级巡检（真实栈）：双路求值（expr 命中 [s1,s2] / 默认兜底 [s1,s3]）、 存量分支回显、抽屉编辑重发布生效、工作流画布回归全绿
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P3 编排后续增强第一项：画布分支可视化编辑（此前 branches 仅保存透传，编辑靠后端 spec）。
前端（后端零改动）
branchAnchor（右下橙锚，拖出经分支 Modal 写 rules）+ruleTargetCheck（分支只允许指向步骤节点）+ruleModalHint（SpEL 按序求值语境提示，留空=默认分支）+expandsRules/layoutUsesRules（分支边渲染/布局计入）+validate（默认分支唯一/目标合法）chainToFlowbranches→rules 映射（存量链零迁移回显）；flowToChain移除 keepBranches 透传，镜像后端 ChainSpecs 约束导出（分支只指向步骤节点/不指自身/默认分支每步骤至多一个/未连入主线步骤拦截）验证
tsc -b && vite build全绿；后端无改动（branches 求值语义 v1.17.0 已交付并有集成测试）== 200命中跳转[s1,s2]（s3 跳过）、抽屉改== 599默认兜底[s1,s3]（s2 跳过），steps_json 断言；保存→回显→再编辑全链路；工作流画布回归（条件规则边/锚点/摘要/结构校验原样）文档