docs: organize product design by feature

Define repository and feature-scoped documentation rules for PRDs, User Stories, logic, UI, technical design, and progress evidence. Move feature-owned documents under docs/features, add one entry point per feature, remove the redundant docs index, and update all affected cross-references. Expand the local tool environment design with explicit product, story, logic, UI, technical, and progress documents.
2026-09-01 14:52:22 +08:00
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+# Smart Heartbeat
+
+Smart Heartbeat 负责按计划或条件主动检查范围内信息，并生成可监督的建议或任务。
+
+## 文档导航
+
+| 文档 | 权威职责 |
+| --- | --- |
+| [智能心跳 PRD](./prd.md) | 用户目标、范围、计划、运行和产品验收 |
+
+当前尚无独立 User Stories、功能逻辑、UI、技术设计和进度文档。