feat: add an optional per-call wall-clock deadline

Give one logical call an optional hard wall-clock boundary (issue #22).
Leaving it unset keeps 1.3.5 behaviour verbatim: the timeout context is
never entered when deadline_s is None.

- new deadline.py: ensure_call_deadline() range check (None or a finite
  positive number; bool/0/nan/inf and out-of-range ints are rejected as
  ValueError so OverflowError never leaks) plus with_call_deadline(),
  which distinguishes an expiry from a TimeoutError raised by the body
  or its cleanup via a local-variable identity comparison rather than
  cm.expired() alone
- new CallDeadlineExceeded: deliberately outside the four categories and
  not a GatewayUnavailableError, and carries no retry_after_s
- new {SCOPE}__CALL_DEADLINE_S key, guarded on the env, direct
  construction and dataclasses.replace paths
- three clients take a call_deadline_s constructor argument and a
  keyword-only per-call override on chat/embed/recognize_text/
  parse_layout; None inherits the assembled value
- validation runs before the awaitable is created, so an illegal value
  cannot strand an un-awaited coroutine
- one embed call shares a single deadline across all of its batches
- import-linter gains a polygateway.deadline layer

- cover where the deadline lands: backoff sleep, admission polling,
  the structured re-ask ladder and embedding's batch loop, plus the
  empty-texts early return that stays outside it
- cover what an expiry costs: exactly one terminal_failure row carrying
  error_type=CallDeadlineExceeded, a cancelled attempt row sharing its
  logical_call_id, cleanup that outlives the deadline (lower bound only)
  and an already-billed success being discarded
- pin the injected clock as orthogonal: a 10^6 second jump never expires
  a call, yet total_latency_ms still reads that clock

pyproject.toml

@@ -82,6 +82,7 @@ layers = [
     "polygateway.middleware",
     "polygateway.transports | polygateway.backends | polygateway.telemetry | polygateway.structured",
     "polygateway.thinking",
+    "polygateway.deadline",
     "polygateway.providers : polygateway.sources",
     "polygateway.ports : polygateway.types : polygateway.errors : polygateway.streaming",
 ]

src/polygateway/__init__.py

@@ -10,6 +10,7 @@ from polygateway.config import EmbeddingSettings, GatewaySettings, OcrSettings
 from polygateway.embedding import EmbeddingClient
 from polygateway.errors import (
     AllSourcesExhausted,
+    CallDeadlineExceeded,
     CircuitOpenError,
     GatewayUnavailableError,
     GovernanceBackendError,
@@ -59,6 +60,7 @@ __all__ = [
     "Effort",
     "AllSourcesExhausted",
     "CallStats",
+    "CallDeadlineExceeded",
     "CircuitOpenError",
     "EmbeddingClient",
     "EmbeddingResponse",

src/polygateway/client.py

@@ -20,6 +20,7 @@ from polygateway.backends.memory.breaker import InMemoryGate
 from polygateway.backends.memory.cache import InMemoryCache
 from polygateway.backends.memory.limiter import InMemoryLimiter
 from polygateway.config import GatewaySettings
+from polygateway.deadline import ensure_call_deadline, with_call_deadline
 from polygateway.errors import PolyGatewayError
 from polygateway.middleware.base import compose
 from polygateway.middleware.cache import CacheMW
@@ -235,10 +236,15 @@ class GatewayClient:
         structured_strategy: StructuredOutputStrategy | None = None,
         structured_escalation: StructuredOutputStrategy | None = None,
         structured_max_retries: int = 1,
+        call_deadline_s: float | None = None,
         now: Any = time.monotonic,
         sleep: Any = asyncio.sleep,
         rng: Any = random.random,
     ) -> None:
+        # 入口即校: 装配错误当场报,不等到第一次调用才炸
+        self._call_deadline_s = ensure_call_deadline(
+            call_deadline_s, "GatewayClient(call_deadline_s=...)"
+        )
         emitter = (
             TelemetryEmitter(telemetry, scope=scope, pricing=pricing, text_cap=text_cap)
             if telemetry is not None
@@ -292,6 +298,8 @@ class GatewayClient:
         self._structured_available = structured_strategy is not None
         self._terminal = terminal  # 内部引用: 装配自省/测试用
         self._handler = compose(middlewares, terminal)
+        # 期限到期需要报出 scope(现之前只传给 RetryMW,未自存)
+        self._scope = scope
         # 逻辑调用统计需要同一只注入钟(1.3.5);现之前只传给中间件未自存
         self._now = now
         # 终态行由公开边界统一写出(T3),故边界也需持有 emitter
@@ -336,6 +344,7 @@ class GatewayClient:
         reasoning_effort: Effort | str | None = None,
         tenant_id: str | None = None,
         meta: Mapping[str, Any] | None = None,
+        call_deadline_s: float | None = None,
     ) -> LLMResponse:
         """一次治理调用(签名冻结,ARCH §5.2;与三项目 LLMProvider 协议兼容)。
 
@@ -351,6 +360,11 @@ class GatewayClient:
         `tenant_id` 与 `meta` 是调用方自定义维度,只进遥测、**不进缓存 key**
         (租户隔离由 `cache_namespace` 负责,ARCH §7.5);前者享有真实列待遇
         (可挂 RLS、可进复合索引),后者是任意 KV 容器(issue #11)。
+
+        `call_deadline_s` 是本次调用的墙钟硬边界(issue #22): `None` = 继承装配值,
+        正数 = 本次覆盖,**不提供"本次关闭"**。它治理的是**等待**: 到期抛
+        `CallDeadlineExceeded`,但到期**不等于未产出、未计费**——在途请求可能已发出、
+        已被上游计费,且清理仍在 `finally` 里完成,故返回时刻 = 期限 + 清理耗时。
         """
         if structured is not None and not self._structured_available:
             raise ImportError(
@@ -377,6 +391,13 @@ class GatewayClient:
             else coerce_effort(reasoning_effort, origin="chat(reasoning_effort=...)")
         )
         validate_thinking_raw(sampling, effort=effort, wire=None, origin="chat overlay")
+        # 期限取值与校验必须在创建 awaitable **之前**: 否则非法值抛错时会遗留
+        # 未 await 的协程(RuntimeWarning + 资源不释放)
+        deadline = (
+            self._call_deadline_s
+            if call_deadline_s is None
+            else ensure_call_deadline(call_deadline_s, "chat(call_deadline_s=...)")
+        )
         # 三项校验均已通过 → 进入统计边界(设计 §3: 输入校验异常在边界之外,保持原行为)
         context = _CallContext(now=self._now)
         request = ChatRequest(
@@ -395,7 +416,9 @@ class GatewayClient:
             call_context=context,
         )
         try:
-            response = await self._handler(request)
+            response = await with_call_deadline(
+                self._handler(request), deadline_s=deadline, scope=self._scope
+            )
         except PolyGatewayError as exc:
             # 统计边界内的一切领域失败均尝试写一条终态行(1.3.5 设计 §6 I3),
             # 包括已有 attempt 错误行的 RequestRejected / ResultInvalid——两类行描述
@@ -485,6 +508,7 @@ class GatewayClient:
             structured_strategy=strategy,
             structured_escalation=escalation,
             structured_max_retries=settings.structured_max_retries,
+            call_deadline_s=settings.call_deadline_s,
         )
         _mark_owned_components(client, limiter=limiter, breaker=breaker, telemetry=telemetry)
         client._owns_cache = cache is None  # 缓存后端可以是 None(backend=none),helper 会跳过

src/polygateway/config.py

@@ -19,6 +19,7 @@ from typing import TYPE_CHECKING
 from dotenv import dotenv_values
 from loguru import logger
 
+from polygateway.deadline import ensure_call_deadline
 from polygateway.types import (
     BackpressurePolicy,
     BreakerConfig,
@@ -182,6 +183,11 @@ class GatewaySettings:
     pricing_path: str | None
     structured_max_retries: int
     lease_ttl_s: float
+    # 一次逻辑调用的**可选**墙钟硬边界(issue #22)。缺省 None = 不启用,行为逐字
+    # 等于 1.3.5;有默认值故追加在末尾,不扰动既有位置构造。`EmbeddingSettings.gateway`
+    # 与 `OcrSettings.gateway` 自动继承。值域由 `_validate_call_deadline` 把关,
+    # 直接构造、`dataclasses.replace` 与 env 三条路一致
+    call_deadline_s: float | None = None
 
     def __post_init__(self) -> None:
         self._normalize()
@@ -192,6 +198,7 @@ class GatewaySettings:
         self._validate_lease()
         self._validate_stall()
         self._validate_probe()
+        self._validate_call_deadline()
 
     def _normalize(self) -> None:
         """把 `from_env` 一直在做的规范化补到构造路上,两条路必须产出同一个值。
@@ -345,6 +352,19 @@ class GatewaySettings:
                 f"timeout_s + {_PROBE_GRACE_S}({floor});调大 probe_ttl_s 或调小源的 timeout_s"
             )
 
+    def _validate_call_deadline(self) -> None:
+        """期限值域守卫: 盖住直接构造与 `dataclasses.replace` 两条路(issue #22)。
+
+        env 路已在 `_load_call_deadline` 里带真实键名报过错, 此处对合法值是幂等空操作。
+        **不校验**它与 `timeout_s`/`stall_window_s` 的大小关系: 期限短于单次超时
+        是调用方的合法选择(要的就是“不让这次调用拖过 N 秒”)。
+        """
+        object.__setattr__(
+            self,
+            "call_deadline_s",
+            ensure_call_deadline(self.call_deadline_s, "GatewaySettings.call_deadline_s"),
+        )
+
     @classmethod
     def from_env(
         cls,
@@ -373,6 +393,7 @@ class GatewaySettings:
             selector=_load_choice(env, f"{scope_u}__SELECTOR", _SELECTORS, "health_aware"),
             quota_full=_load_choice(env, f"{scope_u}__QUOTA_FULL", _QUOTA_FULL, "wait"),
             circuit_open=_load_choice(env, f"{scope_u}__CIRCUIT_OPEN", _CIRCUIT_OPEN, "fail_fast"),
+            call_deadline_s=_load_call_deadline(scope_u, env),
             **_load_pgw(env),
         )
 
@@ -671,6 +692,30 @@ def _load_lease_ttl(env: Mapping[str, str]) -> float:
     return float(_cast(found[1], "float", found[0])) if found else _DEFAULT_LEASE_TTL_S
 
 
+def _load_call_deadline(scope: str, env: Mapping[str, str]) -> float | None:
+    """读 `{SCOPE}__CALL_DEADLINE_S`(issue #22);键未设即 None = 不启用。
+
+    用 `_first` 而非 `_require`: 后者会把"未设"当成配置缺失报错,对存量下游
+    就是破坏性变更。键名两段式(`split("__")` 长度 2 ≠ 4),故 `_load_sources`
+    天然跳过它,不必进 `_RESERVED_SEGMENTS`。
+
+    origin 传**实际命中的 env 键名**而非字段名: `_cast` 只接得住"不是数字",
+    `0`/负数/`inf` 会穿过它落到 `ensure_call_deadline`——那时报一条指向字段名的错误,
+    在多 scope 部署里无法定位是哪个键写错了。
+
+    Args:
+        scope: 已大写的 scope 名。
+        env: 已合并的环境映射。
+
+    Returns:
+        一次逻辑调用的墙钟期限(秒);键未设或为空串时返回 None(不启用)。
+    """
+    found = _first(env, f"{scope}__CALL_DEADLINE_S")
+    if found is None:
+        return None
+    return ensure_call_deadline(_cast(found[1], "float", found[0]), found[0])
+
+
 @dataclass(frozen=True)
 class EmbeddingSettings:
     """Embedding scope 装配配置(M2 §7): 复用 GatewaySettings + embedding 专用键。

src/polygateway/deadline.py

@@ -0,0 +1,80 @@
+"""一次逻辑调用的**可选**墙钟硬边界(issue #22;1.3.6 设计 §3 方案 A)。
+
+只依赖标准库与 `errors.py`(依赖铁律最内层),供三个公开边界各包一次:
+期限治理的是**等待**,不是"到期即无副作用"——在途请求可能已发出、已被上游
+计费,清理照旧在 `finally` 完成,故返回时刻 = 期限 + 清理耗时。
+
+缺省 `None` 时**完全不进上下文管理器**,行为逐字等于 1.3.5。
+"""
+
+from __future__ import annotations
+
+import asyncio
+import math
+from typing import TYPE_CHECKING
+
+from polygateway.errors import CallDeadlineExceeded
+
+if TYPE_CHECKING:
+    from collections.abc import Awaitable
+
+
+def ensure_call_deadline(value: object, origin: str) -> float | None:
+    """全装配路径共用的期限值域校验: `None` 或**有限正数秒**,否则当场 `ValueError`。
+
+    装配错误不属降级面(缺失/非法配置直接报错,不静默取默认值)。`bool` 必须先判:
+    `isinstance(True, int)` 为真,放行会让 `call_deadline_s=True` 变成"1 秒期限"
+    这种没人写得出来的意图。巨大 int(如 `10**400`)超出 float 值域,`float()` 会抛
+    `OverflowError`——它不是 `ValueError` 的子类,泄漏出去会绕过调用方的
+    `except ValueError`,故在此统一成同一种装配错误。
+
+    `origin` 写进消息,用于在多 scope 部署里定位到底是哪个键/哪个参数非法。
+    """
+    if value is None:
+        return None
+    if isinstance(value, bool) or not isinstance(value, (int, float)):
+        raise ValueError(f"{origin} 必须是 None 或有限正数秒: {value!r}")
+    try:
+        seconds = float(value)
+    except OverflowError:
+        raise ValueError(f"{origin} 必须是有限正数秒: {value!r}") from None
+    if not math.isfinite(seconds) or seconds <= 0:
+        raise ValueError(f"{origin} 必须是有限正数秒: {value!r}")
+    return seconds
+
+
+async def with_call_deadline[T](aw: Awaitable[T], *, deadline_s: float | None, scope: str) -> T:
+    """给一个 awaitable 加一层可选期限;到期抛 `CallDeadlineExceeded`。
+
+    三条实现红线:
+
+    1. **校验先于构造 awaitable**——调用方必须先 `ensure_call_deadline`,否则非法值
+       抛错时会遗留未 await 的协程(`RuntimeWarning` + 资源不释放)。
+    2. 只用**相对时长**,绝不把注入的 `now` 换算成绝对截止时刻: 注入钟跳变
+       10^6 秒不该凭空触发期限。
+    3. 判据必须是**局部变量身份比较**,不可退化成只看 `cm.expired()`:
+       到期后清理路径自抛的 `TimeoutError` 也发生在 `expired()` 为真时,只看它
+       会把别人的超时改标成本层期限;`__cause__` 启发式同样失效(内层
+       `asyncio.timeout` 抛出的 `TimeoutError` 其 `__cause__` 也是 `CancelledError`)。
+
+    不新增后台任务、不 `shield`、不改异常对象:外部取消照常以 `CancelledError` 穿透。
+    """
+    if deadline_s is None:
+        # 未启用: 不进上下文管理器,逐字走 1.3.5 旧路径
+        return await aw
+    # 体内(含清理路径)自抛的 TimeoutError 的**身份**,唯一可靠的区分依据
+    inner_timeout: BaseException | None = None
+    # 先建对象再进上下文: `as cm` 只在 `__aenter__` 返回后才绑定, 而 except 块无条件
+    # 读 `cm`——进入阶段一旦异常就会变成 NameError 掩盖真实错误
+    cm = asyncio.timeout(deadline_s)
+    try:
+        async with cm:
+            try:
+                return await aw
+            except TimeoutError as exc:
+                inner_timeout = exc
+                raise
+    except TimeoutError as exc:
+        if cm.expired() and exc is not inner_timeout:
+            raise CallDeadlineExceeded(scope=scope, deadline_s=deadline_s) from None
+        raise

src/polygateway/embedding.py

@@ -28,6 +28,7 @@ from loguru import logger
 
 from polygateway.client import _aclose_component, _telemetry_status_of
 from polygateway.config import EmbeddingSettings
+from polygateway.deadline import ensure_call_deadline, with_call_deadline
 from polygateway.errors import (
     AllSourcesExhausted,
     GovernanceBackendError,
@@ -112,6 +113,7 @@ class EmbeddingClient:
         batch_size: int,
         normalize: bool = False,
         expected_dim: int | None = None,
+        call_deadline_s: float | None = None,
         now: Callable[[], float] = time.monotonic,
         sleep: Callable[[float], Awaitable[None]] = asyncio.sleep,
         rng: Callable[[], float] = random.random,
@@ -120,6 +122,10 @@ class EmbeddingClient:
             raise ValueError("batch_size 必须 ≥ 1")
         if expected_dim is not None and expected_dim < 1:
             raise ValueError("expected_dim 必须 ≥ 1")
+        # 入口即校: 装配错误当场报,不等到第一次调用才炸
+        self._call_deadline_s = ensure_call_deadline(
+            call_deadline_s, "EmbeddingClient(call_deadline_s=...)"
+        )
         self._scope = scope
         # embed payload 硬编码 {model, input},带 extra_body 的源必须先剥离,
         # 否则遥测会记录一个从未发出的采样参数(issue #4 决策 G)
@@ -174,11 +180,16 @@ class EmbeddingClient:
         parent_call_id: str | None = None,
         tenant_id: str | None = None,
         meta: Mapping[str, Any] | None = None,
+        call_deadline_s: float | None = None,
     ) -> EmbeddingResponse:
         """一次治理 embedding 调用: 按 batch_size 切批,批间串行,全批合并返回。
 
         `tenant_id` 与 `meta` 是调用方自定义维度,只进遥测(issue #11);它们属于
         本次调用而非某一批,故每批的遥测行都带同一份维度。
+
+        `call_deadline_s` 是本次调用的墙钟硬边界(issue #22): `None` = 继承装配值。
+        **整次调用共享一份**——N 批串行跑在同一条期限内,不按批数放大 N 倍。
+        `texts == []` 的早返回在期限之外(零尝试,无等待可治)。
         """
         if not isinstance(texts, list) or any(not isinstance(t, str) for t in texts):
             raise TypeError("texts 必须是 list[str](显式优于隐式,不收单条 str)")
@@ -188,6 +199,12 @@ class EmbeddingClient:
         dimension_tenant_id, dimensions = validate_caller_dimensions(
             tenant_id, meta, origin="embed(tenant_id=..., meta=...)"
         )
+        # 期限取值与校验必须在创建 awaitable **之前**(否则遗留未 await 的协程)
+        deadline = (
+            self._call_deadline_s
+            if call_deadline_s is None
+            else ensure_call_deadline(call_deadline_s, "embed(call_deadline_s=...)")
+        )
         # 校验均已通过 → 进入统计边界(设计 §3.5: `texts` 类型与调用方维度校验之后)
         context = _CallContext(now=self._now)
         if not texts:
@@ -206,8 +223,12 @@ class EmbeddingClient:
                 call_stats=context.snapshot(),
             )
         try:
-            return await self._embed_all(
+            return await with_call_deadline(
+                self._embed_all(
                     texts, session_id, parent_call_id, dimension_tenant_id, dimensions, context
+                ),
+                deadline_s=deadline,
+                scope=self._scope,
             )
         except PolyGatewayError as exc:
             await self._emit_terminal(
@@ -634,6 +655,7 @@ class EmbeddingClient:
             batch_size=settings.batch_size,
             normalize=settings.normalize,
             expected_dim=settings.expected_dim,
+            call_deadline_s=gw.call_deadline_s,
         )
         _mark_owned_components(client, limiter=limiter, breaker=breaker, telemetry=telemetry)
         return client

src/polygateway/errors.py

@@ -217,3 +217,23 @@ class GovernanceBackendError(GatewayUnavailableError):
         # 父类会把 message 覆写为 "{scope} 网关暂时不可用: {reason}",而各构造点
         # 携带的诊断串(如"限流后端 try_acquire 失败: ...")是排障主线索,必须保住
         self.args = (message,)
+
+
+class CallDeadlineExceeded(PolyGatewayError):  # noqa: N818 — 设计 §9 人类批准的公共名
+    """调用方设定的整体调用期限到期; 不是网关不可用、也不是源故障。
+
+    刻意**不属**四分类、**不进** `SCOPE_REASONS`、**不继承** `GatewayUnavailableError`:
+    它描述的是调用方自己的耐心边界, 与"对方怎么了"正交——按四分类之一上报会让
+    下游的重试/换源/熔断逻辑对着一次本地超时做治理决策(库铁律「错误分类驱动」)。
+
+    也刻意**没有** `retry_after_s`: 期限到期不含"何时可再试"的信息, 给 `0.0`
+    会按既定语义指示下游立刻重打一条可能已经饱和的通道。
+
+    **到期不等于未产出、未计费**: 期限治理的是等待, 在途请求可能已经发出、
+    已被上游计费, 清理仍在 `finally` 里完成, 故返回时刻 = 期限 + 清理耗时。
+    """
+
+    def __init__(self, *, scope: str, deadline_s: float) -> None:
+        super().__init__(f"{scope} 调用期限 {deadline_s}s 到期")
+        self.scope = scope
+        self.deadline_s = deadline_s

src/polygateway/ocr.py

@@ -23,6 +23,7 @@ from typing import TYPE_CHECKING, Any, Literal
 from loguru import logger
 
 from polygateway.client import _aclose_component, _telemetry_status_of
+from polygateway.deadline import ensure_call_deadline, with_call_deadline
 from polygateway.errors import (
     AllSourcesExhausted,
     GovernanceBackendError,
@@ -115,10 +116,15 @@ class OcrClient:
         circuit_open: str = "fail_fast",
         telemetry: TelemetryRecorder | None = None,
         text_cap: int | None = None,
+        call_deadline_s: float | None = None,
         now: Callable[[], float] = time.monotonic,
         sleep: Callable[[float], Awaitable[None]] = asyncio.sleep,
         rng: Callable[[], float] = random.random,
     ) -> None:
+        # 入口即校: 装配错误当场报,不等到第一次调用才炸
+        self._call_deadline_s = ensure_call_deadline(
+            call_deadline_s, "OcrClient(call_deadline_s=...)"
+        )
         self._scope = scope
         # MonkeyOCR 只发 multipart 表单,带 extra_body 的源必须先剥离,否则
         # 遥测会记录一个从未发出的采样参数(issue #4 决策 G)
@@ -171,10 +177,14 @@ class OcrClient:
         parent_call_id: str | None = None,
         tenant_id: str | None = None,
         meta: Mapping[str, Any] | None = None,
+        call_deadline_s: float | None = None,
     ) -> OcrTextResult:
         """一次治理文本转录(/ocr/text);text 空串 = 合法"无文字"。
 
         `tenant_id` 与 `meta` 是调用方自定义维度,只进遥测(issue #11)。
+
+        `call_deadline_s` 是本次调用的墙钟硬边界(issue #22): `None` = 继承装配值。
+        它治理的是**等待**——到期不等于未产出,返回时刻 = 期限 + 清理耗时。
         """
         # 必须在进链路之前校验: 链路内的一切失败都被遥测层降级成 warning
         # (库铁律「遥测写失败降级不冒泡」),校验放下游等于没有校验
@@ -189,6 +199,7 @@ class OcrClient:
             parent_call_id,
             dimension_tenant_id,
             dimensions,
+            call_deadline_s,
         )
         result = outcome.result
         return OcrTextResult(
@@ -209,10 +220,13 @@ class OcrClient:
         parent_call_id: str | None = None,
         tenant_id: str | None = None,
         meta: Mapping[str, Any] | None = None,
+        call_deadline_s: float | None = None,
     ) -> OcrLayoutResult:
         """一次治理版面解析(/parse → ZIP);elements 空 = 合法"无元素"。
 
         `tenant_id` 与 `meta` 是调用方自定义维度,只进遥测(issue #11)。
+
+        `call_deadline_s` 同 `recognize_text`(issue #22): `None` = 继承装配值。
         """
         # 校验早于链路,理由同 recognize_text;origin 标明方法名以便定位入口
         dimension_tenant_id, dimensions = validate_caller_dimensions(
@@ -226,6 +240,7 @@ class OcrClient:
             parent_call_id,
             dimension_tenant_id,
             dimensions,
+            call_deadline_s,
         )
         result = outcome.result
         return OcrLayoutResult(
@@ -262,17 +277,28 @@ class OcrClient:
         parent_call_id: str | None,
         tenant_id: str | None,
         meta: dict[str, Any],
+        call_deadline_s: float | None = None,
     ) -> tuple[_AttemptOutcome, CallStats]:
         if not isinstance(image, bytes):
             raise TypeError("image 必须是 bytes(路径读取/批量拼帧留业务侧,D9)")
         if not image:
             raise ValueError("image 不能为空")
+        # 期限校验与 `image` 校验同列(仍在 `_CallContext` 之前、创建 awaitable 之前)
+        deadline = (
+            self._call_deadline_s
+            if call_deadline_s is None
+            else ensure_call_deadline(call_deadline_s, f"{operation}(call_deadline_s=...)")
+        )
         # M1 例外: `image` 校验在 `_call` 内而非公开方法,故上下文在该校验
         # **通过之后**创建——这样设计 §3 的"校验在统计边界外"对 OCR 才成立
         context = _CallContext(now=self._now)
         try:
-            return await self._run(
+            return await with_call_deadline(
+                self._run(
                     kind, operation, image, session_id, parent_call_id, tenant_id, meta, context
+                ),
+                deadline_s=deadline,
+                scope=self._scope,
             )
         except PolyGatewayError as exc:
             await self._emit_terminal(
@@ -670,6 +696,7 @@ class OcrClient:
             # OCR 行与 chat 行写同一张 llm_calls;漏传这一条,同表内就一半受控
             # 一半不受控(issue #12)
             text_cap=gw.telemetry_text_cap,
+            call_deadline_s=gw.call_deadline_s,
         )
         _mark_owned_components(client, limiter=limiter, breaker=breaker, telemetry=telemetry)
         return client

tests/unit/test_client.py

@@ -1,8 +1,10 @@
 """GatewayClient 装配与端到端(fake 后端 + MockTransport)测试(设计 §2.4)。"""
 
 import asyncio
+import gc
 import json
 import sys
+import warnings
 from pathlib import Path
 
 import httpx
@@ -10,10 +12,12 @@ import pytest
 
 from polygateway import (
     AllSourcesExhausted,
+    CallDeadlineExceeded,
     GatewayClient,
     GatewaySettings,
     RequestRejectedError,
     ResultInvalidError,
+    TransientError,
     gather_bounded,
 )
 from polygateway.backends.memory.breaker import InMemoryGate
@@ -33,6 +37,10 @@ from polygateway.types import (
     SourceConfig,
 )
 
+# 复用 RetryMW 那份可编程 fake transport(含确定性 `entered` 窗口),不再造第二份;
+# `tests/unit/test_backpressure.py:34` 已是同款复用
+from tests.unit.test_retry import FakeTransport, _ok
+
 _REPO = Path(__file__).resolve().parents[2]
 
 _ENV = {
@@ -1717,3 +1725,207 @@ class TestTerminalEmitDegradation:
                 error=AllSourcesExhausted(scope="llm", reason="retry_exhausted", retry_after_s=1.0),
                 operation="chat",
             )
+
+
+class _ClockJumpTransport:
+    """假 transport: 只推进**注入钟**,真实墙钟几乎不走。
+
+    用于把"期限读哪只钟"与"统计读哪只钟"两件事分开断言。
+    """
+
+    def __init__(self, clock, *, jump):
+        self._clock = clock
+        self._jump = jump
+        self.calls = []
+
+    async def complete(self, *, messages, source, stream, overlay, call_id, reasoning_effort):
+        self.calls.append(call_id)
+        self._clock.advance(self._jump)
+        return _ok()
+
+
+class _SlowRecorder:
+    """假 recorder: 每写一行真实等待一段,用于量化"清理不被期限截断"。"""
+
+    def __init__(self, delay=0.15):
+        self._delay = delay
+        self.rows = []
+
+    async def record_llm_call(self, **fields):
+        await asyncio.sleep(self._delay)
+        self.rows.append(fields)
+
+
+class _SlowSetCache:
+    """假缓存后端: `set` 慢于期限,用于构造"已产出、已计费的成功被丢弃"。"""
+
+    def __init__(self, delay=0.5):
+        self._delay = delay
+        self.data = {}
+        self.sets = 0
+
+    async def get(self, key):
+        return self.data.get(key)
+
+    async def set(self, key, value, ttl_s):
+        self.sets += 1
+        await asyncio.sleep(self._delay)
+        self.data[key] = value
+
+
+class TestChatCallDeadline:
+    """chat 链路的期限覆盖面与到期代价(计划 §5 批次 D/D2)。
+
+    真实事件循环时钟: 期限 0.05s 对被治理的等待(退避 5s、轮询 300s、慢 IO 0.5s)
+    有 10 倍以上余量,故不标 slow。
+    """
+
+    _MSG = [{"role": "user", "content": "hi"}]
+    _DEADLINE = 0.05
+
+    def _rows(self, recorder, kind):
+        return [r for r in recorder.rows if r["event_kind"] == kind]
+
+    # —— 批次 D: 期限落点覆盖面 ——
+
+    async def test_deadline_fires_during_backoff_sleep(self):
+        """退避 sleep 是等待的大头(429 序列可睡到小时级),期限必须能在它中间落地。"""
+        transport = FakeTransport([TransientError("boom", operation="chat"), _ok()])
+        async with _client(transport=transport, retry=RetryPolicy(3, 5.0, 30.0)) as client:
+            with pytest.raises(CallDeadlineExceeded) as exc:
+                await client.chat(self._MSG, call_deadline_s=self._DEADLINE)
+        assert exc.value.scope == "llm" and exc.value.deadline_s == self._DEADLINE
+        # 第二次尝试还压在 5s 退避里,期限确实落在 sleep 上而非 transport 上
+        assert len(transport.calls) == 1
+
+    async def test_deadline_fires_while_queued_for_quota(self):
+        """准入排队(配额满轮询)是第二类长等待: 一次 transport 都没打出去也要能到期。"""
+        source = _source(tpm=1, est_tokens=1000)  # 预扣量恒超本源 TPM → 六闸永不放行
+        limiter = InMemoryLimiter(
+            scope="llm", sources={source.name: source}, global_limits=GlobalLimits(0, 0, 0)
+        )
+        transport = FakeTransport([_ok()])
+        async with _client([source], transport=transport, limiter=limiter) as client:
+            with pytest.raises(CallDeadlineExceeded):
+                await client.chat(self._MSG, call_deadline_s=self._DEADLINE)
+        assert transport.calls == []  # 期限落在轮询里,尝试从未开始
+
+    async def test_deadline_fires_during_structured_re_ask(self):
+        """结构化重问共享同一份期限: 阶梯不得按轮数各起一份,否则期限被放大 N 倍。
+
+        窗口用"第三轮挂起"构造而非 sleep 猜时长——前两轮瞬时返回坏 JSON,
+        期限只可能落在第三轮上,断言因此与机器负载无关。
+        """
+        from pydantic import BaseModel
+
+        class Answer(BaseModel):
+            answer: int
+
+        transport = FakeTransport([_ok("not json at all"), _ok("not json at all"), "hang"])
+        async with _client(
+            transport=transport, structured_max_retries=5, structured_strategy=JsonRepairStrategy()
+        ) as client:
+            with pytest.raises(CallDeadlineExceeded):
+                await client.chat(self._MSG, structured=Answer, call_deadline_s=0.05)
+        # 到期发生在第三轮: 期限确实跨过了两次重问,而不是在首轮就截断
+        assert len(transport.calls) == 3
+
+    # —— 批次 D2: 到期代价 ——
+
+    async def test_expiry_writes_one_terminal_row_and_a_cancelled_attempt(self):
+        """到期恰好一条终态行 + 被取消的 attempt 行,两行同一 logical_call_id。"""
+        recorder = _MemoryRecorder()
+        transport = FakeTransport(["hang"])
+        async with _client(transport=transport, telemetry=recorder) as client:
+            with pytest.raises(CallDeadlineExceeded):
+                await client.chat(self._MSG, call_deadline_s=self._DEADLINE)
+        attempts = self._rows(recorder, "attempt")
+        terminals = self._rows(recorder, "terminal_failure")
+        assert len(terminals) == 1
+        assert terminals[0]["error_type"] == "CallDeadlineExceeded"
+        assert len(attempts) == 1 and attempts[0]["error"] == "cancelled"
+        assert attempts[0]["logical_call_id"] == terminals[0]["logical_call_id"]
+
+        # 零新增遥测列: 期限终态行的列集合与既有失败路径的终态行逐字相同
+        baseline = _MemoryRecorder()
+        async with _client(
+            handler=lambda request: httpx.Response(400, json={"error": {"message": "bad"}}),
+            telemetry=baseline,
+        ) as client:
+            with pytest.raises(RequestRejectedError):
+                await client.chat(self._MSG)
+        assert set(terminals[0]) == set(self._rows(baseline, "terminal_failure")[0])
+
+    async def test_cleanup_is_not_cut_short_by_the_expiry(self):
+        """返回时刻 = 期限 + 清理耗时: 只断下界(> 期限 × 2),不断上界。"""
+        recorder = _SlowRecorder(delay=0.15)  # attempt 行与终态行各付一次
+        transport = FakeTransport(["hang"])
+        loop = asyncio.get_running_loop()
+        started = loop.time()
+        async with _client(transport=transport, telemetry=recorder) as client:
+            with pytest.raises(CallDeadlineExceeded):
+                await client.chat(self._MSG, call_deadline_s=self._DEADLINE)
+        elapsed = loop.time() - started
+        assert len(recorder.rows) == 2  # 清理照常写完两行,没被期限截断
+        assert elapsed > self._DEADLINE * 2, f"清理疑似被截断: {elapsed}s"
+
+    async def test_expiry_discards_a_success_that_was_already_billed(self):
+        """到期 ≠ 未产出、未计费: transport 已成功一次,结果仍被丢弃。"""
+        transport = FakeTransport([_ok()])
+        cache = _SlowSetCache(delay=0.5)  # 写缓存慢于期限 → 到期落在成功之后
+        async with _client(
+            transport=transport, cache=cache, cache_namespace="proj", cache_ttl_s=600
+        ) as client:
+            with pytest.raises(CallDeadlineExceeded):
+                await client.chat(self._MSG, call_deadline_s=self._DEADLINE)
+        assert len(transport.calls) == 1  # 上游已经产出并计费
+        assert cache.sets == 1 and cache.data == {}  # 结果既没回给调用方也没落缓存
+
+    # —— 批次 E: 注入钟与期限正交 ——
+
+    async def test_injected_clock_jump_does_not_trigger_the_deadline(self):
+        """期限只认真实墙钟: 注入钟跳 10^6 秒也不该凭空到期(不换算绝对截止时刻)。"""
+        clock = _StatsClock()
+        transport = _ClockJumpTransport(clock, jump=1_000_000.0)
+        async with _client(transport=transport, now=clock) as client:
+            resp = await client.chat(self._MSG, call_deadline_s=5.0)
+        assert resp.content == "ok"
+        # 而统计仍逐字读注入钟(10^6 s = 10^9 ms),两只钟各司其职
+        assert resp.call_stats is not None
+        assert resp.call_stats.total_latency_ms == 1_000_000_000
+
+    async def test_expiry_latency_still_reads_the_injected_clock(self):
+        """期限由真实钟触发,终态行的耗时仍取自注入钟(真实耗时只有几十毫秒)。"""
+        clock = _StatsClock()
+        recorder = _TickingRecorder(clock, tick=0.5)
+        transport = FakeTransport(["hang"])
+        async with _client(transport=transport, telemetry=recorder, now=clock) as client:
+            with pytest.raises(CallDeadlineExceeded):
+                await client.chat(self._MSG, call_deadline_s=self._DEADLINE)
+        terminal = [r for r in recorder.rows if r["event_kind"] == "terminal_failure"][0]
+        assert terminal["total_latency_ms"] == 500  # attempt 行那一次 tick,不是真实的 ~50ms
+
+
+class TestChatCallDeadlineEntryGuards:
+    """per-call 入口校验的两条硬红线(计划 §3.4/§5 批次 E)。"""
+
+    _MSG = [{"role": "user", "content": "hi"}]
+
+    async def test_illegal_per_call_value_leaves_no_un_awaited_coroutine(self):
+        """校验先于构造 awaitable: 否则非法值抛错时遗留未 await 的协程(资源不释放)。"""
+        transport = FakeTransport([_ok()])
+        async with _client(transport=transport) as client:
+            with warnings.catch_warnings(record=True) as caught:
+                warnings.simplefilter("always")
+                with pytest.raises(ValueError, match=r"chat\(call_deadline_s"):
+                    await client.chat(self._MSG, call_deadline_s=0)
+                gc.collect()  # 未 await 的协程在回收时才发 RuntimeWarning
+        assert [w for w in caught if "never awaited" in str(w.message)] == []
+        assert transport.calls == []
+
+    async def test_per_call_none_inherits_the_assembled_deadline(self):
+        """`None` = 继承装配值(不提供"本次关闭"): 装配了期限就照样到期。"""
+        transport = FakeTransport(["hang"])
+        async with _client(transport=transport, call_deadline_s=0.05) as client:
+            with pytest.raises(CallDeadlineExceeded):
+                await client.chat(self._MSG)

tests/unit/test_config.py

@@ -1041,3 +1041,58 @@ def test_live_unknown_wire_assembly_is_local_only():
         GatewayClient.from_settings(
             dataclasses.replace(settings, sources=(source,)), registry=register_provider(mystery)
         )
+
+
+class TestCallDeadlineConfig:
+    """`{SCOPE}__CALL_DEADLINE_S` 与三个 client 入口参数的值域四条路(issue #22)。"""
+
+    def test_key_unset_means_disabled(self):
+        assert GatewaySettings.from_env("LLM", env=_env()).call_deadline_s is None
+
+    def test_env_key_parsed(self):
+        s = GatewaySettings.from_env("LLM", env=_env(**{"LLM__CALL_DEADLINE_S": "30"}))
+        assert s.call_deadline_s == 30.0
+
+    @pytest.mark.parametrize("bad", ["0", "-1", "nan", "inf", "abc"])
+    def test_env_illegal_value_reports_the_actual_key_name(self, bad):
+        """origin 必须是实际命中的 env 键名,多 scope 部署里才定位得到是哪个键。"""
+        with pytest.raises(ValueError, match="LLM__CALL_DEADLINE_S"):
+            GatewaySettings.from_env("LLM", env=_env(**{"LLM__CALL_DEADLINE_S": bad}))
+
+    def test_direct_construction_is_guarded(self):
+        base = GatewaySettings.from_env("LLM", env=_env())
+        with pytest.raises(ValueError, match="GatewaySettings.call_deadline_s"):
+            dataclasses.replace(base, call_deadline_s=0)
+
+    def test_plain_constructor_call_is_guarded_too(self):
+        """`dataclasses.replace` 与直接构造是两条路: 守卫在 `__post_init__` 才两条都盖住。
+
+        只在 `from_env` 里校验的话,直接 `GatewaySettings(...)` 装配的下游(测试/高级
+        注入路径,CLAUDE.md §4.5 的第二条装配路)会把非法期限一路带到第一次调用才炸。
+        """
+        base = GatewaySettings.from_env("LLM", env=_env())
+        fields = {f.name: getattr(base, f.name) for f in dataclasses.fields(base)}
+        with pytest.raises(ValueError, match="GatewaySettings.call_deadline_s"):
+            GatewaySettings(**{**fields, "call_deadline_s": float("inf")})
+        # 合法值走同一条路不受影响(守卫对合法值是幂等空操作)
+        assert GatewaySettings(**{**fields, "call_deadline_s": 7}).call_deadline_s == 7.0
+
+    def test_replace_with_legal_value_is_idempotent(self):
+        base = GatewaySettings.from_env("LLM", env=_env())
+        assert dataclasses.replace(base, call_deadline_s=5).call_deadline_s == 5.0
+
+    def test_deadline_shorter_than_timeout_is_legal(self):
+        """期限短于单次 timeout_s 是调用方的合法选择,不做跨字段耦合校验。"""
+        s = GatewaySettings.from_env("LLM", env=_env(**{"LLM__CALL_DEADLINE_S": "1"}))
+        assert s.call_deadline_s == 1.0 and s.sources[0].timeout_s == 120.0
+
+    def test_from_settings_propagates_to_client(self):
+        s = GatewaySettings.from_env("LLM", env=_env(**{"LLM__CALL_DEADLINE_S": "12"}))
+        assert GatewayClient.from_settings(s)._call_deadline_s == 12.0
+
+    def test_client_init_validates_at_entry(self):
+        """三个 client 的 `__init__` 直传非法值也当场报错(不经 settings 那道守卫)。"""
+        from tests.unit.test_client import _client
+
+        with pytest.raises(ValueError, match=r"GatewayClient\(call_deadline_s"):
+            _client(call_deadline_s=0)

tests/unit/test_deadline.py

@@ -0,0 +1,142 @@
+"""`deadline.py` 值域校验与五种形态区分测试(计划 §5 批次 A/B)。
+
+用真实事件循环时钟(期限 0.05s、体 0.3s,4-10 倍余量),不标 slow:
+被测对象是"哪一种 TimeoutError"的身份判据,注入钟无法覆盖 `asyncio.timeout`。
+"""
+
+import asyncio
+
+import pytest
+
+from polygateway.deadline import ensure_call_deadline, with_call_deadline
+from polygateway.errors import CallDeadlineExceeded
+
+# —— 批次 A: 值域 ——
+
+
+def test_ensure_call_deadline_accepts_none_and_positive():
+    assert ensure_call_deadline(None, "origin") is None
+    assert ensure_call_deadline(3, "origin") == 3.0
+    assert ensure_call_deadline(0.5, "origin") == 0.5
+
+
+@pytest.mark.parametrize(
+    "bad",
+    [0, 0.0, -1, -0.5, float("nan"), float("inf"), float("-inf"), "1", True, False, object(), []],
+)
+def test_ensure_call_deadline_rejects_out_of_range(bad):
+    with pytest.raises(ValueError) as exc:
+        ensure_call_deadline(bad, "GatewayClient(call_deadline_s=...)")
+    assert "GatewayClient(call_deadline_s=...)" in str(exc.value)
+
+
+def test_ensure_call_deadline_rejects_huge_int_without_leaking_overflow():
+    """超出 float 值域的巨大 int 也统一 ValueError,不泄漏 OverflowError。"""
+    with pytest.raises(ValueError) as exc:
+        ensure_call_deadline(10**400, "origin")
+    assert "origin" in str(exc.value)
+
+
+# —— 批次 B: 五种形态 ——
+
+
+async def test_deadline_expiry_raises_call_deadline_exceeded():
+    async def body():
+        await asyncio.sleep(0.3)
+
+    with pytest.raises(CallDeadlineExceeded) as exc:
+        await with_call_deadline(body(), deadline_s=0.05, scope="llm")
+    assert exc.value.scope == "llm"
+    assert exc.value.deadline_s == 0.05
+
+
+async def test_inner_timeout_before_expiry_propagates_as_is():
+    async def body():
+        async with asyncio.timeout(0.01):
+            await asyncio.sleep(0.3)
+
+    with pytest.raises(TimeoutError) as exc:
+        await with_call_deadline(body(), deadline_s=5.0, scope="llm")
+    assert not isinstance(exc.value, CallDeadlineExceeded)
+
+
+async def test_cleanup_timeout_after_expiry_is_not_relabelled():
+    """到期后清理路径自抛 TimeoutError → 原样上抛(钉住身份比较,不看 expired())。"""
+
+    async def body():
+        try:
+            await asyncio.sleep(0.3)
+        except asyncio.CancelledError:
+            raise TimeoutError("cleanup") from None
+
+    with pytest.raises(TimeoutError) as exc:
+        await with_call_deadline(body(), deadline_s=0.05, scope="llm")
+    assert not isinstance(exc.value, CallDeadlineExceeded)
+    assert str(exc.value) == "cleanup"
+
+
+async def test_external_cancel_before_expiry_propagates_cancelled():
+    entered = asyncio.Event()
+
+    async def body():
+        entered.set()
+        await asyncio.sleep(0.3)
+
+    task = asyncio.create_task(with_call_deadline(body(), deadline_s=5.0, scope="llm"))
+    await entered.wait()
+    task.cancel()
+    with pytest.raises(asyncio.CancelledError):
+        await task
+
+
+async def test_external_cancel_after_expiry_propagates_cancelled():
+    """到期已在途、外部又取消 → 仍是 CancelledError(取消优先,不被改标)。"""
+
+    started = asyncio.Event()
+
+    async def body():
+        started.set()
+        try:
+            await asyncio.sleep(0.3)
+        except asyncio.CancelledError:
+            await asyncio.sleep(0.2)  # 清理期,期间遭外部取消
+            raise
+
+    task = asyncio.create_task(with_call_deadline(body(), deadline_s=0.05, scope="llm"))
+    await started.wait()
+    await asyncio.sleep(0.1)  # 让期限先到期,进入清理
+    task.cancel()
+    with pytest.raises(asyncio.CancelledError):
+        await task
+
+
+async def test_narrow_success_returns_value_without_pending_cancellation():
+    async def body():
+        await asyncio.sleep(0.01)
+        return "ok"
+
+    async def runner():
+        return await with_call_deadline(body(), deadline_s=0.2, scope="llm")
+
+    task = asyncio.create_task(runner())
+    assert await task == "ok"
+    assert task.cancelling() == 0
+
+
+async def test_domain_error_inside_window_propagates():
+    class BoomError(RuntimeError):
+        pass
+
+    async def body():
+        raise BoomError("boom")
+
+    with pytest.raises(BoomError):
+        await with_call_deadline(body(), deadline_s=0.05, scope="llm")
+
+
+async def test_none_deadline_takes_the_legacy_path():
+    async def body():
+        await asyncio.sleep(0.05)
+        return "ok"
+
+    assert await with_call_deadline(body(), deadline_s=None, scope="llm") == "ok"

tests/unit/test_embedding.py

@@ -13,6 +13,7 @@ import pytest
 from loguru import logger
 
 from polygateway.errors import (
+    CallDeadlineExceeded,
     RequestRejectedError,
     ResultInvalidError,
     SourceDeadError,
@@ -662,3 +663,70 @@ class TestEmbedLogicalCallStats:
         assert resp.call_stats.attempts == 0
         assert resp.call_stats.logical_call_id  # 真实 ID,不是空串
         assert rec.rows == []  # 零遥测行
+
+
+class _SlowEmbedTransport:
+    """假 embedding transport: 每批真实耗时 `delay` 秒。
+
+    "N 批共享一份期限"只能用真实等待来证——`asyncio.timeout` 认的是事件循环
+    时钟,注入钟推不动它(计划 §5 批次 D)。
+    """
+
+    def __init__(self, *, delay):
+        self._delay = delay
+        self.calls = []
+
+    async def embed(self, *, texts, source, call_id):
+        self.calls.append(list(texts))
+        await asyncio.sleep(self._delay)
+        return _vec_for(texts)
+
+
+class TestEmbedCallDeadline:
+    """embedding 的期限语义: 整次调用一份,空输入豁免(计划 §5 批次 D/E)。"""
+
+    async def test_one_deadline_is_shared_across_all_batches(self):
+        """按批各起一份会让期限被批数放大 N 倍: 单批 0.05s 远小于期限 0.5s 时将永不到期。
+
+        余量刷到 10 倍(单批 0.05s vs 期限 0.5s): 要报假结论得单批慢 10 倍,
+        而不是机器抳一下就变色。
+        """
+        transport = _SlowEmbedTransport(delay=0.05)
+        client, _ = _embed_client([_src()], [], batch_size=1, transport=transport)
+        loop = asyncio.get_running_loop()
+        started = loop.time()
+        with pytest.raises(CallDeadlineExceeded) as exc:
+            await client.embed([str(i) for i in range(20)], call_deadline_s=0.5)
+        elapsed = loop.time() - started
+        assert exc.value.scope == "embed"
+        # 按批计的话 20 批全都能跑完(根本不会抛),共享一份则跑不到头
+        assert 2 <= len(transport.calls) < 20
+        assert elapsed < 20 * 0.05, f"总时长疑似随批数放大: {elapsed}s"
+
+    async def test_empty_input_is_exempt_from_the_deadline(self):
+        """`texts == []` 早返回在 try 之外(零尝试、无等待可治),再小的期限也不该拦它。"""
+        transport = ScriptedEmbedTransport([])
+        client, _ = _embed_client([_src()], [], transport=transport)
+        resp = await client.embed([], call_deadline_s=1e-6)
+        assert resp.vectors == []
+        assert resp.call_stats is not None and resp.call_stats.attempts == 0
+        assert transport.calls == []
+
+    async def test_the_same_tiny_deadline_does_fire_on_a_non_empty_input(self):
+        """对照组: 上一条用的 1e-6 秒确实是会到期的值,豁免不是因为期限没生效。"""
+        transport = _SlowEmbedTransport(delay=0.05)
+        client, _ = _embed_client([_src()], [], transport=transport)
+        with pytest.raises(CallDeadlineExceeded):
+            await client.embed(["a"], call_deadline_s=1e-6)
+
+    async def test_illegal_per_call_value_is_rejected_at_the_entry(self):
+        """per-call 非法值当场 ValueError,且消息指向 `embed(...)` 而非某个 env 键。"""
+        transport = ScriptedEmbedTransport([])
+        client, _ = _embed_client([_src()], [], transport=transport)
+        with pytest.raises(ValueError, match=r"embed\(call_deadline_s"):
+            await client.embed(["a"], call_deadline_s=0)
+        assert transport.calls == []
+
+    def test_illegal_constructor_value_is_rejected_at_assembly(self):
+        with pytest.raises(ValueError, match=r"EmbeddingClient\(call_deadline_s"):
+            _embed_client([_src()], [], call_deadline_s=-1)

tests/unit/test_ocr_client.py

@@ -13,6 +13,7 @@ from polygateway.backends.memory.breaker import InMemoryGate
 from polygateway.backends.memory.limiter import InMemoryLimiter
 from polygateway.errors import (
     AllSourcesExhausted,
+    CallDeadlineExceeded,
     CircuitOpenError,
     RequestRejectedError,
     ResultInvalidError,
@@ -669,3 +670,29 @@ class TestOcrLogicalCallStats:
             await client.recognize_text("not-bytes")
         with pytest.raises(ValueError):
             await client.recognize_text(b"")
+
+
+class TestOcrCallDeadline:
+    """OCR 两个公开入口的期限与 per-call 校验(计划 §3.4/§5 批次 D/E)。"""
+
+    async def test_expiry_on_a_hanging_transport(self):
+        client, limiter, _ = _client([_src()], ["hang"])
+        with pytest.raises(CallDeadlineExceeded) as exc:
+            await client.recognize_text(b"jpg", call_deadline_s=0.05)
+        assert exc.value.scope == "ocr" and exc.value.deadline_s == 0.05
+        # 清理照常在 finally 完成: 在途计数必须归零(OCR 无 token,结算恒 0)
+        stats = await limiter.source_stats("m1")
+        assert stats.inflight == 0 and stats.tpm_used == 0
+
+    @pytest.mark.parametrize("method", ["recognize_text", "parse_layout"])
+    async def test_illegal_per_call_value_names_the_entry_it_came_from(self, method):
+        """两个入口各自报自己的名字: 多入口部署里才定位得到是哪次调用传错了。"""
+        transport = ScriptedOcrTransport([])
+        client, _, _ = _client([_src()], [], transport=transport)
+        with pytest.raises(ValueError, match=rf"{method}\(call_deadline_s"):
+            await getattr(client, method)(b"jpg", call_deadline_s=float("inf"))
+        assert transport.calls == []
+
+    def test_illegal_constructor_value_is_rejected_at_assembly(self):
+        with pytest.raises(ValueError, match=r"OcrClient\(call_deadline_s"):
+            _client([_src()], [], call_deadline_s=0)