Make `image` key configurable for thumbnails/images#421

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Schallbert wants to merge 11 commits intojekyll:masterfrom

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Commits on Nov 16, 2025

make 'image' key user-customizable
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update readme: explain customization of image key in front matter
Schallbert
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Commits on Nov 17, 2025

make tests run OK
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Commits on Nov 18, 2025

rewind refactoring in generator
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add tests for ruby code
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Commits on Nov 19, 2025

add custom thumb_key tests
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Commits on Nov 20, 2025

unify header of spec.rb files
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Commits on Nov 22, 2025

address review findings: Replace "thumb" with "image", remove unnecessary capture
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Commits on Nov 24, 2025

update to have business logic in Liquid only
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fix liquid error, use double quotes, remove generator tests as not required anymore
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Commits on Nov 30, 2025

feed: pull some assignments before post-loop for efficiency
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