Summary

• support keyword arguments in marker expressions passed to -m
• match marker metadata in build and lock task selection while keeping -k and after= semantics unchanged
• reject escaped marker-expression strings without misreading backslashes elsewhere in the expression
• document marker metadata selection and its supported values

Adapted from pytest commit 15c33fbaa and pytest #14475.

Tests

• uv run --group test pytest tests/test_mark_expression.py tests/test_mark.py tests/test_task.py tests/test_lock_command.py -q
• just typing
• targeted pre-commit checks
• just docs