[attrs plugin] Field level kw_only=False ignored with kw_only=True at class level

[getzze]

Bug Report

When setting kw_only=True at class level with attrs, all fields are set to be keyword only. Since attrs=v25.4.0, individual attributes with kw_only=False are treated as positional (to be consistent with dataclasses, see python-attrs/attrs#1457).
But Mypy still considers attributes with kw_only=False to be keyword only.

To Reproduce

from attrs import define, field

@define(kw_only=True)
class Parent:
    param: int = field(kw_only=False)
    optional: bool = True


# Valid
p1 = Parent(1)
p2 = Parent(2, optional=False)

@define
class A:
    a: int
    b: int = field(kw_only=True, default=1)

@define(kw_only=True)
class B(A):
    c: int = field(kw_only=False)
    d: int = 3

# Valid
B(0, 1)
B(0, 1, b=3, d=4)

Expected Behavior

Mypy should not return any error as it's valid behavior with attrs>=v25.4.0

Actual Behavior

test_mypy.py:12: error: Too many positional arguments for "Parent"  [misc]
    p1 = Parent(1)
         ^~~~~~~~~
test_mypy.py:13: error: Too many positional arguments for "Parent"  [misc]
    p2 = Parent(2, optional=False)
         ^~~~~~~~~~~~~~~~~~~~~~~~~
test_mypy.py:26: error: Too many positional arguments for "B"  [misc]
    B(0, 1)
    ^~~~~~~
test_mypy.py:26: error: Missing named argument "c" for "B"  [call-arg]
    B(0, 1)
    ^~~~~~~
test_mypy.py:27: error: "B" gets multiple values for keyword argument "b"  [misc]
    B(0, 1, b=3, d=4)
    ^~~~~~~~~~~~~~~~~
test_mypy.py:27: error: Missing named argument "c" for "B"  [call-arg]
    B(0, 1, b=3, d=4)
    ^~~~~~~~~~~~~~~~~
Found 6 errors in 1 file (checked 1 source file)

Your Environment

Python 3.14.3
mypy 1.19.1 (compiled: no)
attrs 25.4.0