* chore: update Node.js to 26.0.0
* fix(jest-config): use amaro for type stripping on Node.js 26
Node.js v26 removed the `transform` mode and `sourceMap` option from
`module.stripTypeScriptTypes`. Switch the Jest transform to call
`amaro.transformSync` directly (the same wasm transformer Node.js wraps)
so we keep inline source maps for tests.
* test: use `import type` in more places
Several tests are failing because a module isn't being mocked. This is
due to the mocked module being imported before the mock being set up.
Switching to `import type` should elide the import fully.
* build: replace ts-jest with simple transformer
* chore: remove `ts-jest`
* chore: remove babel dependencies from root project
* ci: use Node.js 22.13.0 (instead of 22.12.0)
Node.js 22.13.0 introduces the `stripTypeScriptTypes` function
* fix: copilot feedback
