Fix fragment input deductions in `max_variables_count,input`#4546

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ErichDonGubler wants to merge 3 commits intogpuweb:mainfrom

erichdongubler-mozilla:fragment_input_deductions-in-max_variables_count

Commits on Dec 27, 2025

refactor: lower some vars. in `max_variables_count,input`
ErichDonGubler
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fix: correctly count fragment input deductions for built-ins in `max_variables_count,input`
ErichDonGubler
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feat: `max_variables_count,input`: add `numVariablesDelta: -3` case
ErichDonGubler
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