Reports

• new derivations feature to allow computing values from existing values. @dantleech (see documentation)
• deprecate baseline_expressions as the same can now be accomplished with derivations. @dantleech
• introduce aggregate-preview report (includes diff column): will become the new aggregate in PHPBench 2.0 @dantleech

Expressions

• lazy function evaluation on select functions (currently exclusive to the if() function). @dantleech
• allow the nullsafe operator on bare variables

Meta

• Exclude docs and other non-code assets in .gitattributes @sasezaki
• Bump phpstan to 2.x @dantleech