MIDAS API client.

Spec-driven HTTP client built on Martian. The OpenAPI spec bundled in
resources/midas-spec/openapi.yaml is the single source of truth for
endpoint definitions and parameter validation.

Authentication flow:
  1. Call (get-token username password) to obtain a 10-minute bearer token
  2. Call (create-client token) to create an authenticated Martian client
  3. Use the client with API functions (rin-list, rate-values, etc.)

MIDAS entity coercion: raw API responses → idiomatic Clojure maps.

Two-layer data model:
  Raw layer   — direct JSON→EDN, PascalCase keys, string values
  Coerced layer — namespaced keywords, native types (java.time, BigDecimal)

All coerced entities carry the original raw data as :midas/raw metadata.

Malli schemas for coerced MIDAS entities (the public contract).

Malli schemas for raw MIDAS API responses (boundary validation).