docs: add per-project migration documents as design constraints

Add research-wiki/migrations/ (govdoc-saas, video-tree-trm5,
chsanalyzer): deletion lists, component mappings, call-site
inventories, config migration, stepwise rollback plans, legacy
behavior audits, and reverse constraints on the library design
including flagged architecture gaps.

CLAUDE.md

@@ -109,6 +109,7 @@ project_root/
 |---|---|
 | 架构全貌: 决策 D1-D13 及讨论过程、端口清单、错误分类、子系统设计、迁移验收 | `research-wiki/ARCHITECTURE.md`(单一事实源) |
 | 开发顺序与里程碑状态 | `research-wiki/ROADMAP.md`(活文档,随进度更新) |
+| 三项目迁移文档(ARCHITECTURE §11 的展开,库设计的常驻约束) | `research-wiki/migrations/`(govdoc-saas / video-tree-trm5 / chsanalyzer) |
 | 功能设计文档(每次实现新功能时新增) | `research-wiki/designs/` |
 | 实现计划 | `research-wiki/plans/` |
 | 治理网关参考实现 | `reference/Video-Tree-TRM5/adapters/`(llm/breaker/streaming/redis_cache/telemetry) |