refactor: move bundled skills tree to repo root skills/

- Relocate runtime/skills -> skills/; runtime_skills_root() prefers oclaw/skills
  with fallback to legacy runtime/skills for unmigrated trees.
- session-bootstrap hook handler resolves repo root via PROJECT_ROOT.
- Update architecture/migration docs and in-tree skill references.

Co-authored-by: Cursor <cursoragent@cursor.com>

docs/ARCHITECTURE_OVERVIEW.md

@@ -16,7 +16,7 @@
 - `runtime/core/`：可复用执行内核（如 agent 执行管线聚合入口）。
 - `runtime/app/`：应用侧入口组织（面向外部流程的 runtime 编排）。
 - `runtime/agents|chat|orchestration|workers`：领域能力模块。
-- `runtime/skills|hooks|extensions`：可扩展能力载体。
+- `skills/`、`runtime/hooks`、`runtime/extensions`：可扩展能力载体（技能包在仓库根 `skills/`）。
 - `runtime/operations/scripts`：运维脚本与生成器。
 
 ## 路径规范

docs/OCLAW_COMPAT_REMOVAL_CHECKLIST.md

@@ -20,8 +20,8 @@ Use this checklist to verify readiness and post-delete safety for `oclaw/app_ser
 - [x] Runtime role context now loads from `oclaw/runtime/workspaces/*`.
 - [x] Skill root priority still effective:
   - [x] `AIA_SKILLS_ROOT`
-  - [x] `oclaw/runtime/skills`
-  - [x] `skills/` fallback
+  - [x] `oclaw/skills`（仓库根）
+  - [x] `oclaw/runtime/skills`（旧路径回退）
 
 ## Extension policy checks
 - [x] Primary extension source remains `oclaw/extensions/`.

docs/OCLAW_MIGRATION_GUIDE.md

@@ -74,6 +74,6 @@ This repository now uses **repo-root relative** runtime wiring.
 - Role context is loaded from `oclaw/runtime/workspaces/*`.
 - Skills root priority:
   1. `AIA_SKILLS_ROOT`
-  2. `oclaw/runtime/skills`
-  3. `skills/` (legacy fallback)
+  2. `oclaw/skills`（仓库根）
+  3. `oclaw/runtime/skills`（旧布局，若仍存在则 `runtime_skills_root()` 会回退）