feat: ж/д слой + cant_swim в скоринг + профили вне модели

Определение специфических рекомендаций (матрица профилей §8):

1. Ж/д слой (закрыт мёртвый railway ×2.5 у РАС):
   - /api/v1/water/{case_id} отдаёт railway=rail как LineString
     (без service/industrial/military веток), кэш общий v2;
   - railway_warning «перекрыть/проверить немедленно» по профилям;
   - SearchMap: Polyline слой ж/д (тёмно-красный), счётчики 💧/🚂.

2. cant_swim → профиль не_умеет_плавать (water ×3.0, без изменения
   радиуса, critical_warning «обследовать водоёмы НЕМЕДЛЕННО»):
   - раньше чекбокс влиял только на текст, в скоринге был пробел;
   - derive в analyze._derive_profiles — работает и для closed_cases.

3. unmodeled_profiles: ДЦП/слабое зрение/слух — честная пометка
   «вне поведенческой модели» с пояснением (vector_tasks B12:
   профили без аналога не выдавать за учтённые); блок на фронте
   в карточке здоровья.

Площадь воды: сферический эксцесс, проверен на квадрате 53° (744017 м²
vs 743272 точного). Тесты: 202 passed (новый test_cant_swim_profile).

.venv-test/lib/python3.12/site-packages/_pytest/stash.py

@@ -0,0 +1,116 @@
+from __future__ import annotations
+
+from typing import Any
+from typing import cast
+from typing import Generic
+from typing import TypeVar
+
+
+__all__ = ["Stash", "StashKey"]
+
+
+T = TypeVar("T")
+D = TypeVar("D")
+
+
+class StashKey(Generic[T]):
+    """``StashKey`` is an object used as a key to a :class:`Stash`.
+
+    A ``StashKey`` is associated with the type ``T`` of the value of the key.
+
+    A ``StashKey`` is unique and cannot conflict with another key.
+
+    .. versionadded:: 7.0
+    """
+
+    __slots__ = ()
+
+
+class Stash:
+    r"""``Stash`` is a type-safe heterogeneous mutable mapping that
+    allows keys and value types to be defined separately from
+    where it (the ``Stash``) is created.
+
+    Usually you will be given an object which has a ``Stash``, for example
+    :class:`~pytest.Config` or a :class:`~_pytest.nodes.Node`:
+
+    .. code-block:: python
+
+        stash: Stash = some_object.stash
+
+    If a module or plugin wants to store data in this ``Stash``, it creates
+    :class:`StashKey`\s for its keys (at the module level):
+
+    .. code-block:: python
+
+        # At the top-level of the module
+        some_str_key = StashKey[str]()
+        some_bool_key = StashKey[bool]()
+
+    To store information:
+
+    .. code-block:: python
+
+        # Value type must match the key.
+        stash[some_str_key] = "value"
+        stash[some_bool_key] = True
+
+    To retrieve the information:
+
+    .. code-block:: python
+
+        # The static type of some_str is str.
+        some_str = stash[some_str_key]
+        # The static type of some_bool is bool.
+        some_bool = stash[some_bool_key]
+
+    .. versionadded:: 7.0
+    """
+
+    __slots__ = ("_storage",)
+
+    def __init__(self) -> None:
+        self._storage: dict[StashKey[Any], object] = {}
+
+    def __setitem__(self, key: StashKey[T], value: T) -> None:
+        """Set a value for key."""
+        self._storage[key] = value
+
+    def __getitem__(self, key: StashKey[T]) -> T:
+        """Get the value for key.
+
+        Raises ``KeyError`` if the key wasn't set before.
+        """
+        return cast(T, self._storage[key])
+
+    def get(self, key: StashKey[T], default: D) -> T | D:
+        """Get the value for key, or return default if the key wasn't set
+        before."""
+        try:
+            return self[key]
+        except KeyError:
+            return default
+
+    def setdefault(self, key: StashKey[T], default: T) -> T:
+        """Return the value of key if already set, otherwise set the value
+        of key to default and return default."""
+        try:
+            return self[key]
+        except KeyError:
+            self[key] = default
+            return default
+
+    def __delitem__(self, key: StashKey[T]) -> None:
+        """Delete the value for key.
+
+        Raises ``KeyError`` if the key wasn't set before.
+        """
+        del self._storage[key]
+
+    def __contains__(self, key: StashKey[T]) -> bool:
+        """Return whether key was set."""
+        return key in self._storage
+
+    def __len__(self) -> int:
+        """Return how many items exist in the stash."""
+        return len(self._storage)