parallel-apis-specs-array.md

counterfact	minor

Add specs array to counterfact.yaml for parallel APIs.

A specs key can now be added to counterfact.yaml to mount multiple OpenAPI documents at distinct URL base paths from a single server instance. When specs is present it takes precedence over spec.

specs:
  - source: ./billing.yaml
    base: billing

  - source: https://example.com/identity.yaml
    base: identity

Each spec generates route and type files into its own subdirectory under the configured destination (e.g. billing/routes/ and identity/routes/). A separate Dispatcher, Registry, CodeGenerator, and ModuleLoader is created per spec, keeping each class focused on a single API.