AGENTS.md: the attribute-docstring doctest paragraph is v1 history

[derek73]

One paragraph of AGENTS.md (the Doctests gotcha, line ~405) still described tests/test_config_attribute_docstrings.py (#195) as the mechanism that runs .. doctest:: examples inside Constants attribute docstrings. Neither half exists: since the M11 swap the real Constants lives in nameparser/_config_shim.py with bare type annotations (patronymic_name_order: bool) and no attribute docstrings, and the test was deleted in M12 (a689e1d8) because its AST walk found no class in the re-export shim and nothing to run in the real one.

The paragraph is rewritten in the file's "2.0 note" form: the v1 mechanism and why it existed stay as history, the deletion and its reason are stated, and a future attribute example is pointed at a unit test per the lean-docs rule. No code, no tests.

Found while landing #543 (a fix-round implementer tried to run the cited file). Docs only; uv run ruff check . unaffected.

🤖 Generated with Claude Code

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.78%. Comparing base (e3be17a) to head (4c8b93e).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #545   +/-   ##
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  Coverage   98.78%   98.78%           
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  Files          45       45           
  Lines        3703     3703           
=======================================
  Hits         3658     3658           
  Misses         45       45           

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