Clean up new isStatic/notStatic

[shadowhand]

Refs #310

[Copilot]

Pull request overview

This PR refactors the isStatic and notStatic assertion methods to accept broader callable types beyond just Closure, improving flexibility. The changes update parameter and return types, rename parameters from $closure to $callable for clarity, and introduce a helper method callableToClosure() to handle the conversion.

Key changes:

• Broadened isStatic/notStatic to accept Closure|callable instead of just Closure
• Added callableToClosure() helper method to convert callables to closures or return callable strings
• Updated all related wrapper methods in Mixin.php to reflect the new parameter names and types

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
src/Assert.php	Refactored isStatic/notStatic methods to accept broader callable types and added callableToClosure() helper
src/Mixin.php	Updated wrapper methods to use new $callable parameter name and updated type annotations
tests/static-analysis/assert-isStatic.php	Updated test function to match new signature with broader types
tests/static-analysis/assert-notStatic.php	Updated test function to match new signature with broader types
CHANGELOG.md	Added entry for new isStatic and notStatic assertions

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