FIX: robust `DatetimeIndex.union` across DST transitions#63088

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antznette1 wants to merge 8 commits intopandas-dev:mainfrom

antznette1:bug/62915-dst-union-fix

Commits on Nov 12, 2025

TST: xfail test for DatetimeIndex.union across DST boundary (GH#62915)
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TST: wrap long comment to satisfy ruff E501 (GH#62915)
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FIX: robust DatetimeIndex.union across DST transitions + flip test to pass (GH#62915)
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TYPING: narrow tz-aware union path to DatetimeArray in _union to satisfy mypy; behavior unchanged (GH#62915)
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BUG: tz-aware DatetimeIndex.union - perform UTC-naive base union when tz matches to avoid recursion; preserve semantics for differing tz; mypy-safe ops; wrap long comment (GH#62915)
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CI: retrigger pipeline for PR #63088
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TST: make xfail for test_np_fix conditional on runtime behavior to avoid XPASS in numpy-dev/python-dev
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Merge branch 'main' into bug/62915-dst-union-fix
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