Building an Alchemy provider

A provider is built on a flywheel. Each turn of it makes both the SDK and the provider more correct:

 1. distilled SDK ──> 2. alchemy resources ──> 3. live tests
        ^                                          │
        └──── 4. distilled patches <── wrong error / wrong schema

The live API is the only authority. A resource is done when its test passes against the real provider, and every mismatch that test surfaced is fixed in distilled rather than worked around in alchemy.