refactor(sdlc): 技能 base_dir 改全局 skills/（单一技能树，去掉机构副本路径）

- agent_loop: _build_role_skills_block/_load_skill_by_name 改 get_skills_base()
- agent_loop_v2: _resolve_skills_base_dir 改返回 get_skills_base()

pipeline_service/agent_loop.py

@@ -1016,10 +1016,8 @@ async def _build_role_skills_block(sor, project_id, role, org_id=""):
     try:
         pid = await _resolve_pipeline_id(project_id)
         from pipeline_core.skill_loader import get_skill_loader, SCOPE_PRIORITY, SCOPE_TAG
-        from pipeline_core.skill_pack import ensure_org_skills
-        from .workspace import get_workspace_base
-        ws_base = await get_workspace_base(sor)
-        skills_dir = ensure_org_skills(ws_base, org_id or '0')
+        from pipeline_core.skill_pack import get_skills_base
+        skills_dir = get_skills_base()
         loader = get_skill_loader(skills_dir)
         merged = loader.get_merged(pipeline_id=pid, role=role,
                                    project_id=project_id, org_id=org_id or '0')
@@ -1050,10 +1048,8 @@ async def _load_skill_by_name(sor, project_id, role, org_id, name, file_path=Non
     try:
         pid = await _resolve_pipeline_id(project_id)
         from pipeline_core.skill_loader import get_skill_loader
-        from pipeline_core.skill_pack import ensure_org_skills
-        from .workspace import get_workspace_base
-        ws_base = await get_workspace_base(sor)
-        skills_dir = ensure_org_skills(ws_base, org_id or '0')
+        from pipeline_core.skill_pack import get_skills_base
+        skills_dir = get_skills_base()
         loader = get_skill_loader(skills_dir)
         merged = loader.get_merged(pipeline_id=pid, role=role,
                                    project_id=project_id, org_id=org_id or '0')

pipeline_service/agent_loop_v2.py

@@ -410,16 +410,10 @@ class AgentExecutor:
         self.space = GENERAL_SPACE if self.generic else (self.pipeline_id or GENERAL_SPACE)
 
     async def _resolve_skills_base_dir(self):
-        """技能根目录 = 机构工作目录/skills/（多租户隔离，不在全局应用目录）。"""
+        """技能根目录 = 全局 skills/（单一技能树，所有机构共享读，2026-08-21 重构）。"""
         try:
-            from sqlor.dbpools import DBPools
-            from pipeline_service.workspace import get_workspace_base
-            from pipeline_core.skill_pack import ensure_org_skills
-            db = DBPools()
-            async with db.sqlorContext("pipeline") as sor:
-                ws_base = await get_workspace_base(sor)
-            org_id = self.org_id or '0'
-            return ensure_org_skills(ws_base, org_id)
+            from pipeline_core.skill_pack import get_skills_base
+            return get_skills_base()
         except Exception:
             return self.config.skills.base_dir