docs: clarify row placement as row-level shell including context menu

tests/test_actions_manifest.py

@@ -514,6 +514,8 @@ class TestActionsManifest(unittest.TestCase):
             "数组相对顺序",
             "全部直接展示",
             "左右分栏",
+            "行级入口",
+            "行右键",
         ):
             self.assertIn(marker, text, msg=f"ACTIONS.md missing {marker!r}")
         self.assertNotIn(
@@ -521,6 +523,17 @@ class TestActionsManifest(unittest.TestCase):
             text,
             msg="ACTIONS.md must not document removed overflow more-menu truncation",
         )
+        self.assertIn(
+            "新增 `row-context-menu` 等 placement",
+            text,
+            msg="ACTIONS.md must forbid inventing a separate row-context-menu placement",
+        )
+        placement_enum = _load_actions_schema().get("$defs", {}).get("placement", {}).get("enum") or []
+        self.assertNotIn(
+            "row-context-menu",
+            placement_enum,
+            msg="skill-actions.schema must not add row-context-menu to placements enum",
+        )
         for forbidden in (
             "数据管理 toolbar " + "只挂",
             "toolbar " + "只放 async",