[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

[FMorgan-111]

RepoPilot v2 could not complete an automatic fix.

Reason: Context collection made no progress (located the same files again).

Relevant files:

• mypy/plugins/dataclasses.py: filename appears in issue text, path components match issue terms; bm25 rerank score=51.044; matched issue terms: attrs, plugin, field, kw, only, false; bm25 rerank score=69.514; matched issue terms: attrs, plugin, field, kw, only, false; bm25 rerank score=79.190; matched issue terms: attrs, plugin, field, kw, only, false; bm25 rerank score=79.190; matched issue terms: attrs, plugin, field, kw, only, false
• test-data/unit/check-dataclasses.test: matched GitHub code search; bm25 rerank score=77.533; matched issue terms: field, kw, only, false, true, at; bm25 rerank score=77.533; matched issue terms: field, kw, only, false, true, at
• mypy/plugins/attrs.py: filename appears in issue text, path components match issue terms; bm25 rerank score=44.117; matched issue terms: attrs, plugin, field, level, kw, only; bm25 rerank score=60.894; matched issue terms: attrs, plugin, field, level, kw, only; bm25 rerank score=69.797; matched issue terms: attrs, plugin, field, level, kw, only; bm25 rerank score=69.797; matched issue terms: attrs, plugin, field, level, kw, only
• test-data/unit/fine-grained.test: matched GitHub code search; bm25 rerank score=71.857; matched issue terms: attrs, plugin, field, kw, only, false; bm25 rerank score=71.857; matched issue terms: attrs, plugin, field, kw, only, false
• test-data/unit/check-plugin-attrs.test: matched GitHub code search; bm25 rerank score=55.853; matched issue terms: attrs, plugin, field, kw, only, false; bm25 rerank score=59.074; matched issue terms: attrs, plugin, field, kw, only, false; bm25 rerank score=59.074; matched issue terms: attrs, plugin, field, kw, only, false
• test-data/unit/check-dataclass-transform.test: matched GitHub code search; bm25 rerank score=48.948; matched issue terms: field, kw, only, false, true, class; bm25 rerank score=51.257; matched issue terms: field, kw, only, false, true, class; bm25 rerank score=51.257; matched issue terms: field, kw, only, false, true, class

Attempts:
No patch attempts were made.

Token usage: 34185/100000