docs: add cross-repo roadmap and centralize doc conventions

- docs/ROADMAP.md: decompose enhancement work into sub-projects P0-P8
  (ops foundation -> product value -> governance) with ordering rationale
- docs/CHANGELOG.md: start the wrapper changelog
- AGENTS.md: monorepo wrapper role, master-direct commits scoped to the
  wrapper, all specs/plans live in this repo's docs/ from now on

docs/CHANGELOG.md

@@ -0,0 +1,19 @@
+# Changelog / 更新日志
+
+All notable changes to this repository should be documented in this file.
+本仓库的重要变更建议统一记录在此文件中。
+
+The format loosely follows Keep a Changelog and can be adapted to the team's habits.
+本文档参考了 Keep a Changelog 的思路，也可以根据团队习惯调整。
+
+## [0.1.0] - 2026-09-29
+
+### Added / 新增
+
+- Added `docs/ROADMAP.md`: the cross-repo roadmap decomposed into sub-projects P0–P8 (ops foundation → product value → governance), with ordering rationale and a doc index for future specs and plans.
+- 新增 `docs/ROADMAP.md`：跨仓库路线图，分解为 P0–P8 子项目（上线底座 → 产品价值 → 治理长尾），含排序理由与后续 spec/计划的文档索引。
+
+### Changed / 变更
+
+- Doc convention: all specs, implementation plans and cross-repo coordination docs now live in the monorepo `docs/` instead of per-repo `docs/superpowers/`; this supersedes the crearte-deploy 0.3.0 "canonical home" convention. Commits in the monorepo wrapper may go directly to `master` (user-approved); the three inner repos keep their own branch rules.
+- 文档约定：所有 spec、实现计划与跨仓库协作文档统一收归 monorepo `docs/`，不再散落各内层仓库的 `docs/superpowers/`；此约定取代 crearte-deploy 0.3.0 的「canonical home」约定。monorepo wrapper 可直接提交 `master`（维护者确认），内层三仓仍遵循各自分支规范。