Auth strategies

ChainAPI ships six auth strategies covering the patterns 95% of APIs use:

Strategy	When to use
simple	Single login request returns a token
chain	Multi-step (e.g. send-OTP → verify-OTP)
api_key	Pre-issued static credential
oauth2_client_credentials	Client-credentials grant
oauth2_password	Resource-owner password grant
oauth1	OAuth 1.0a signed requests

Detailed YAML examples for each are in the authoring guide.