diff --git a/app/platform/auth.py b/app/platform/auth.py
index b604cb5..89f9d79 100644
--- a/app/platform/auth.py
+++ b/app/platform/auth.py
@@ -97,9 +97,10 @@ def verify_password(password: str, password_hash: str, salt: str) -> bool:
 
 
 @functools.lru_cache(maxsize=1)
-def _dummy_credentials() -> tuple[str, str]:
+def dummy_credentials() -> tuple[str, str]:
     """固定哑凭据 (password_hash, salt)——登录查无用户时跑一次同代价
-    verify,抹平"用户不存在秒回/密码错 50ms"的时序枚举面。"""
+    verify,抹平"用户不存在秒回/密码错 50ms"的时序枚举面。公共面:
+    auth_routes 的防枚举时序等化依赖它。"""
     return hash_password("", salt=b"\x00" * 16)
 
 
@@ -237,8 +238,11 @@ class UserContext:
     must_change_password: bool
 
 
-def _bearer_token(request: Request) -> str | None:
-    """Authorization: Bearer <token> → token;非该形态返回 None。"""
+def bearer_token(request: Request) -> str | None:
+    """Authorization: Bearer <token> → token;非该形态返回 None。
+
+    公共面:get_current_user 依赖与 auth_routes 的 logout/change-password
+    (依赖验过后重读头取原串)共用同一解析,不各写一份漂移。"""
     header = request.headers.get("authorization", "")
     if not header.startswith("Bearer "):
         return None
@@ -250,7 +254,7 @@ async def get_current_user(request: Request) -> UserContext:
 
     缺头/坏格式/未知/过期一律 401(静态文案,不细分原因——token 本身
     就是凭据,细化文案只会泄露信息)。"""
-    token = _bearer_token(request)
+    token = bearer_token(request)
     record = token_store.validate(token) if token else None
     if record is None:
         raise HTTPException(status_code=401, detail="未认证或凭证已失效")
@@ -264,22 +268,6 @@ async def get_current_user(request: Request) -> UserContext:
 CurrentUser = Annotated[UserContext, Depends(get_current_user)]
 
 
-def require_super(user: CurrentUser) -> UserContext:
-    """非 super → 403(端点级覆盖在 Task 5;本任务依赖直测)。"""
-    if user.role != "super":
-        raise HTTPException(status_code=403, detail="需要平台超管权限")
-    return user
-
-
-def require_tenant(slug: str):
-    """依赖工厂: super 或指定租户的管理员放行,否则 403。"""
-    def _dep(user: CurrentUser) -> UserContext:
-        if user.role == "super" or user.tenant_slug == slug:
-            return user
-        raise HTTPException(status_code=403, detail="无权访问该租户资源")
-    return _dep
-
-
 def enforce_password_changed(user: CurrentUser) -> UserContext:
     """must_change_password=True → 409:除 login/change-password 外的受保护
     端点都要过本依赖(引导/重置出的初始密码不得只当摆设——spec 强制
@@ -293,3 +281,25 @@ def enforce_password_changed(user: CurrentUser) -> UserContext:
 # `user: platform_user`(= get_current_user + enforce_password_changed,
 # 链式 Depends 自动先认证后查标志)。
 platform_user = Annotated[UserContext, Depends(enforce_password_changed)]
+
+
+def require_super(user: platform_user) -> UserContext:
+    """非 super → 403(端点级覆盖在 Task 5;本任务依赖直测)。
+
+    参数走 platform_user(认证+已改密连锁):Task 5 路由挂本依赖时
+    must_change 409 门自动生效,不可能静默漏挂。"""
+    if user.role != "super":
+        raise HTTPException(status_code=403, detail="需要平台超管权限")
+    return user
+
+
+def require_tenant(slug: str):
+    """依赖工厂: super 或指定租户的管理员放行,否则 403。
+
+    参数同 require_super 走 platform_user——409 门连锁,理由见其
+    docstring。"""
+    def _dep(user: platform_user) -> UserContext:
+        if user.role == "super" or user.tenant_slug == slug:
+            return user
+        raise HTTPException(status_code=403, detail="无权访问该租户资源")
+    return _dep
diff --git a/app/platform/routes/auth_routes.py b/app/platform/routes/auth_routes.py
index 965b9ce..2b3a385 100644
--- a/app/platform/routes/auth_routes.py
+++ b/app/platform/routes/auth_routes.py
@@ -6,7 +6,7 @@ TDD 循环闭环;Task 3 为 /api/platform/ 前缀加中间件豁免,豁免≠放
 
 安全纪律:
 - 防枚举: 用户不存在/停用/密码错同一 401 静态文案;查无用户时跑等代价
-  哑 scrypt(auth._dummy_credentials)抹平时序差。
+  哑 scrypt(auth.dummy_credentials)抹平时序差。
 - 密码/token 永不进日志: 本模块不 log 任何凭据字段,HTTPException
   detail 均静态串。
 - token 走 Authorization: Bearer(无 Cookie 免 CSRF,spec §7.2)。
@@ -19,8 +19,8 @@ from sqlalchemy.ext.asyncio import AsyncSession
 
 from app.platform.auth import (
     CurrentUser,
-    _dummy_credentials,
-    _bearer_token,
+    bearer_token,
+    dummy_credentials,
     hash_password,
     login_limiter,
     platform_user,
@@ -51,7 +51,12 @@ def _client_ip(request: Request) -> str:
 
 @router.post("/login")
 async def login(body: LoginRequest, request: Request):
-    """限流 → 查用户(active)→ 验密 → 发 token。"""
+    """限流 → 查用户(active)→ 验密 → 发 token。
+
+    token 是签发时快照(校验不回查库):租户停用后其管理员的存量 token
+    最长再存活一个 TTL(默认 8h)——本实现接受该窗口,不做停用即时锁死;
+    若需要即时失效,归 Task 5 租户管理端点(validate 时回查 Tenant.status
+    并吊销该租户 token),此处注记归属而非留白。"""
     ip = _client_ip(request)
     if not login_limiter.allow(body.username, ip):
         raise HTTPException(status_code=429, detail=LOCKED_DETAIL)
@@ -70,7 +75,7 @@ async def login(body: LoginRequest, request: Request):
     else:
         # 防枚举(时序): 查无用户/停用也跑一次等代价 scrypt,响应耗时与
         # 密码错不可区分;结果仍统一 401
-        dummy_hash, dummy_salt = _dummy_credentials()
+        dummy_hash, dummy_salt = dummy_credentials()
         verify_password(body.password, dummy_hash, dummy_salt)
         ok = False
 
@@ -100,7 +105,7 @@ async def logout(request: Request, user: platform_user):
     (Task 5 起所有 /api/platform/* 受保护端点统一走 platform_user,
     login/change-password 豁免)。依赖已验过 token,此处重读头取原串
     撤销——409/401 都在依赖层先行。"""
-    token_store.revoke(_bearer_token(request) or "")
+    token_store.revoke(bearer_token(request) or "")
     return {"ok": True}
 
 
@@ -128,5 +133,5 @@ async def change_password(
         db_user.must_change_password = False
         await session.commit()
 
-    token_store.clear_must_change(_bearer_token(request) or "")
+    token_store.clear_must_change(bearer_token(request) or "")
     return {"ok": True, "must_change_password": False}
diff --git a/tests/test_auth.py b/tests/test_auth.py
index 9f5a8ae..de97d0d 100644
--- a/tests/test_auth.py
+++ b/tests/test_auth.py
@@ -159,3 +159,37 @@ def test_tenant_admin_role_scoped():
     with pytest.raises(HTTPException) as ei2:
         dep(other)
     assert ei2.value.status_code == 403            # 它租户 403
+
+
+def test_role_dependencies_chain_must_change_409(app_client):
+    """审查修复 Issue 1: require_super/require_tenant 参数走 platform_user
+    (get_current_user + enforce 连锁)——must_change=True 的请求先撞 409 门,
+    Task 5 路由挂角色依赖时不可能静默漏挂。
+
+    连锁只在 FastAPI 依赖解析时生效(直调函数体只跑角色判断),故用
+    一次性探针 app 挂真实 DI 验证;token 经主 app 的真实 login/change-password
+    路由取放(同一进程级 TokenStore)。端点级覆盖仍在 Task 5。"""
+    from fastapi import Depends, FastAPI
+    from fastapi.testclient import TestClient
+
+    probe = FastAPI()
+
+    @probe.post("/probe-super")
+    async def _super(user=Depends(require_super)):
+        return {"user_id": user.user_id}
+
+    @probe.post("/probe-tenant")
+    async def _tenant(user=Depends(require_tenant("jiancai"))):
+        return {"user_id": user.user_id}
+
+    token = _login(app_client).json()["token"]   # 超管, must_change=True
+    with TestClient(probe) as c:
+        # 409 门先于角色判断
+        assert c.post("/probe-super", headers=_auth(token)).status_code == 409
+        assert c.post("/probe-tenant", headers=_auth(token)).status_code == 409
+        # 改密(标志就地清零)后放行到角色层: super 两个依赖都过
+        app_client.post(
+            CHANGE_PW, headers=_auth(token),
+            json={"old_password": "admin123", "new_password": "n3w-pass-9"})
+        assert c.post("/probe-super", headers=_auth(token)).status_code == 200
+        assert c.post("/probe-tenant", headers=_auth(token)).status_code == 200