Migrate from spago-legacy to spago

[m-rinaldi]

migrate to new spago (spago.yaml)

Summary

Migrates the build tooling from spago-legacy (Dhall-based) to the current spago (YAML-based).

Changes

spago.yaml — test configuration

The old test.dhall extended spago.dhall with extra source globs and test-only dependencies. In new spago, test configuration lives directly under package.test in spago.yaml. However, new spago's package.test does not support custom sources — only test/**/*.purs is used for test sources.

docs/Examples/ → test/Examples/

The example .purs and .js files were previously included in the test build via the docs/Examples/**/*.purs glob in test.dhall. Since that glob can no longer be expressed in spago.yaml, and the examples exist primarily as test fixtures (imported directly by IntegrationSpec.purs), they have been moved to test/Examples/. Module names and all imports are unchanged. Documentation (Readme.md, assets) remains in docs/Examples/.

test.dhall removed

No longer needed; superseded by the package.test section in spago.yaml.

Compiler warnings fixed

Removed unused imports across example files and TestHelpers.purs, and fixed warnings in RequestSpec.purs.

[f-f]

@m-rinaldi could you also upgrade CI while we are at it? it's using deprecated actions

[sigma-andex]

Seems spago is still on an old version

[f-f]

yeah I think this will need updating

[m-rinaldi]

On the way: purescript-contrib/setup-purescript#47

[f-f]

Thanks @m-rinaldi this is great!!