fix(gateway): 熔断计入持续 4xx + 去 assert + Protocol/transient 去重

P1-2 非可重试错误(持续 401/403)也 record_failure，坏 key 可触发熔断。
P1-9 _complete_structured 的 assert 改显式 raise ValueError（-O 安全）。
P2 GatewayRun 抽到 orchestrator/_protocols.py 单点（去 4 处重复）；
  _is_transient 抽到 adapters/base.py is_transient_by_name（去 3 处重复）；
  Gemini Protocol 改 async def；gateway._retrying 去无用 async。

packages/core/ww_core/orchestrator/__init__.py

@@ -8,6 +8,7 @@
 
 from __future__ import annotations
 
+from ._protocols import GatewayRun
 from .collect import (
     CONTINUITY,
     FORESHADOW,
@@ -43,7 +44,6 @@ from .review_node import (
     REVIEW_INCOMPLETE,
     REVIEW_OK,
     BoundReviewNode,
-    GatewayRun,
     build_review_context,
     build_review_request,
     make_review_node,

packages/core/ww_core/orchestrator/_protocols.py

@@ -0,0 +1,17 @@
+"""编排器节点对网关的最小依赖 Protocol（单点定义，DRY）。
+
+仅依赖 `ww_llm_gateway.types`（无环）→ 各节点（review/generation/outline/style_extract）
+共用此单一定义，不再每模块各自重复声明（见 memory/gotchas.md 更新）。
+"""
+
+from __future__ import annotations
+
+from typing import Protocol
+
+from ww_llm_gateway.types import LlmRequest, LlmResponse
+
+
+class GatewayRun(Protocol):
+    """编排器节点对网关的最小依赖——只需 `run`（注入真网关或 mock）。"""
+
+    async def run(self, req: LlmRequest) -> LlmResponse: ...

packages/core/ww_core/orchestrator/generation_node.py

@@ -25,7 +25,6 @@ from __future__ import annotations
 
 import uuid
 from collections.abc import Sequence
-from typing import Protocol
 
 import structlog
 from pydantic import BaseModel
@@ -37,21 +36,13 @@ from ww_agents import (
     ContinuityReview,
     WorldGenResult,
 )
-from ww_llm_gateway.types import Block, LlmRequest, LlmResponse, Scope
+from ww_llm_gateway.types import Block, LlmRequest, Scope
+
+from ._protocols import GatewayRun
 
 log = structlog.get_logger(__name__)
 
 
-class GatewayRun(Protocol):
-    """生成节点对网关的最小依赖——只需 `run`（注入真网关或 mock）。
-
-    模块内部用（每模块各自声明，不跨模块复用、不在 orchestrator `__init__` 重复导出，
-    见 gotchas 2026-06-18）。
-    """
-
-    async def run(self, req: LlmRequest) -> LlmResponse: ...
-
-
 def _build_request(
     spec: AgentSpec,
     *,

packages/core/ww_core/orchestrator/graph.py

@@ -23,8 +23,9 @@ from ww_agents import (
     style_drift_spec,
 )
 
+from ._protocols import GatewayRun
 from .collect import ReviewRecorder, collect_reviews
-from .review_node import GatewayRun, run_review
+from .review_node import run_review
 from .state import ChapterState
 from .write_node import GatewayStream, write_node
 

packages/core/ww_core/orchestrator/outline_node.py

@@ -16,21 +16,16 @@
 from __future__ import annotations
 
 import uuid
-from typing import Protocol
 
 import structlog
 from ww_agents import AgentSpec, OutlineResult
-from ww_llm_gateway.types import Block, LlmRequest, LlmResponse, Scope
+from ww_llm_gateway.types import Block, LlmRequest, Scope
+
+from ._protocols import GatewayRun
 
 log = structlog.get_logger(__name__)
 
 
-class GatewayRun(Protocol):
-    """大纲节点对网关的最小依赖——只需 `run`（注入真网关或 mock）。"""
-
-    async def run(self, req: LlmRequest) -> LlmResponse: ...
-
-
 def build_outline_request(
     spec: AgentSpec,
     *,

packages/core/ww_core/orchestrator/review_node.py

@@ -19,12 +19,13 @@ M2 先接 **continuity**（C6 `continuity_spec`），设计成可扩——图按
 from __future__ import annotations
 
 from collections.abc import Awaitable, Callable
-from typing import Any, Protocol
+from typing import Any
 
 import structlog
 from ww_agents import AgentSpec
-from ww_llm_gateway.types import Block, LlmRequest, LlmResponse, Scope
+from ww_llm_gateway.types import Block, LlmRequest, Scope
 
+from ._protocols import GatewayRun
 from .state import ChapterState
 
 log = structlog.get_logger(__name__)
@@ -36,11 +37,16 @@ REVIEW_INCOMPLETE = "incomplete"  # 该审网关失败 → 标未完成，不阻
 # 已绑定 gateway 的节点形（图工厂 / T2.5 直接跑审稿时用）。
 BoundReviewNode = Callable[[ChapterState], Awaitable[dict[str, Any]]]
 
-
-class GatewayRun(Protocol):
-    """审稿节点对网关的最小依赖——只需 `run`（注入真网关或 mock）。"""
-
-    async def run(self, req: LlmRequest) -> LlmResponse: ...
+__all__ = [
+    "REVIEW_INCOMPLETE",
+    "REVIEW_OK",
+    "BoundReviewNode",
+    "GatewayRun",
+    "build_review_context",
+    "build_review_request",
+    "make_review_node",
+    "run_review",
+]
 
 
 def build_review_context(*, draft: str, stable_core: str, volatile: str) -> str:

packages/core/ww_core/orchestrator/style_extract_node.py

@@ -17,25 +17,16 @@
 from __future__ import annotations
 
 import uuid
-from typing import Protocol
 
 import structlog
 from ww_agents import AgentSpec, StyleFingerprintResult
-from ww_llm_gateway.types import Block, LlmRequest, LlmResponse, Scope
+from ww_llm_gateway.types import Block, LlmRequest, Scope
+
+from ._protocols import GatewayRun
 
 log = structlog.get_logger(__name__)
 
 
-class GatewayRun(Protocol):
-    """文风提取节点对网关的最小依赖——只需 `run`（注入真网关或 mock）。
-
-    模块内部用（每模块各自声明，不跨模块复用、不在 orchestrator `__init__` 重复导出，
-    见 gotchas 2026-06-18）。
-    """
-
-    async def run(self, req: LlmRequest) -> LlmResponse: ...
-
-
 def build_style_extract_request(
     spec: AgentSpec,
     *,