Release v1.4.0

[derek73]

Summary

Version bump for the v1.4 milestone (4/4 issues closed: #260, #262, #263, #265):

• Bump VERSION to (1, 4, 0) in nameparser/_version.py
• Sync CITATION.cff's version: field to match (it had drifted since 1.3.0 -- the 1.3.1 patch release didn't touch it)
• Stamp docs/release_log.rst's 1.4.0 - Unreleased header with today's date

Also included: AGENTS.md staleness fixes

Caught during the pre-release doc review (step 0 of the release checklist):

• TupleManager/RegexTupleManager.__getattr__'s description said it "answer[s] any unknown attribute lookup" -- no longer accurate since TupleManager unknown-key access silently returns None / EMPTY_REGEX; raise AttributeError in 2.0 #256 added a DeprecationWarning on unknown-key access. Corrected, and documented the warning's dunder/sunder exclusions plus the consequence that internal parser code reading self.C.regexes.<key> unconditionally now warns against partial custom regexes overrides.
• The new _EmptyAttributeDefaultAttribute descriptor (Remove empty_attribute_default; empty attributes always return '' #255) wasn't documented alongside the existing _SetManagerAttribute/_CachedUnionMember descriptors -- added, including why __get__(obj=None) returns '' instead of self (load-bearing for Constants.__repr__, not just mypy) and why __getstate__/__setstate__ need inspect.getattr_static instead of plain getattr to detect it.

Test plan

• Full suite: 1540 passed / 22 xfailed, noise-free
• Sphinx doctest + html builds clean
• python -c "from nameparser import __version__; print(__version__)" → 1.4.0

🤖 Generated with Claude Code

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Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.67%. Comparing base (b6c0679) to head (37a6e8f).
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Additional details and impacted files

@@           Coverage Diff           @@
##           master     #287   +/-   ##
=======================================
  Coverage   97.67%   97.67%           
=======================================
  Files          13       13           
  Lines         947      947           
=======================================
  Hits          925      925           
  Misses         22       22           

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