Added Arkane xTB ESS adapter#2914

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alongd wants to merge 4 commits intomainfrom

Commits on Apr 19, 2026

Added the Arkane xTB ESS adapter

alongd
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sevyharris
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Tests: Arkane xTB

alongd
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sevyharris
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only run python 3.9 conda build on PRs

JacksonBurns
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sevyharris
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update Arkane statmech to handle xtb adapter
sevyharris
committed