feat: add einsum with deterministic accumulation and generic contraction

kernels

fix: fromArray now actually uses the provided shape parameter

refactor: migrate FFI layer to Lib singleton with instance methods

fix(stack): normalize stacked arrays to row-major layout for PHP meta…

…data

feat: allow optional axis index on `NDArray::shape()`

chore: remove version entry from composer.json

chore: update GitHub Actions workflow to use matrix for OS selection (#…

…10)

* chore: update GitHub Actions workflow to use matrix for OS selection

* chore: add ffi extension to PHP version setup in GitHub Actions workflow

* chore: add ffi extension to PHP version setup in GitHub Actions workflow

* fix: force bash as shell for building library on test to work on Windows

* chore: update GitHub Actions workflow to use actions/checkout@v6 and ramsey/composer-install@v4

refactor(rust): simplify copy, fill, and assign operations

Refactor FFI array operations to use standardized view extraction helpers instead of wrapper methods. Removes redundant macros and simplifies the wrapper module by inlining operation logic directly in FFI functions.

chore: bump version to 1.0.0