feat: add transform package

[thewtex]

No description provided.

[Copilot]

Pull Request Overview

Add a new transform package that provides spatial transformation pipelines, TypeScript bindings, and test data, while integrating build and test tasks into the global manifest.

• Introduce packages/transform with TS package, C++ pipelines, test data, and CMake support
• Update top-level pixi.toml and itk_wasm_env.bash to include transform build/test tasks and environment vars
• Add manifest (pixi.toml), package definitions, and CMake rules for native and WASM transform pipelines

Reviewed Changes

Copilot reviewed 15 out of 17 changed files in this pull request and generated 2 comments.

Show a summary per file

File	Description
pixi.toml	Register global build/test tasks for transform package
packages/transform/typescript/package.json	Define new TypeScript package and build scripts for transform
packages/transform/pixi.toml	Pixi manifest for transform package pipelines
packages/transform/create-transform.cxx	C++ implementation of create-*-transform pipelines
packages/transform/CMakeLists.txt	CMake setup for transform pipelines and tests
itk_wasm_env.bash	Export environment variables for transform test data downloads

Files not reviewed (1)

• pnpm-lock.yaml: Language not supported

Comments suppressed due to low confidence (2)

packages/transform/pixi.toml:4

• The description appears copied from another package and does not reflect the transform pipelines. Update it to describe spatial transform pipelines.

description = "Pipelines for downsampling images."

packages/transform/typescript/package.json:18

• [nitpick] The TS package has no real test script and fails by default. Consider adding real tests or removing the placeholder to ensure test coverage.

    "test": "echo \"Error: no test specified\" && exit 1",