QA Provider Lanes

QA provider lanes are registered in index.ts and implemented in one folder per provider. Shared provider contracts and mock-provider helpers live in shared/. Mock lanes should use shared/mock-provider-definition.ts unless they need a custom shape.

Each provider definition owns:

• its accepted providerMode
• default primary, alternate, and image-generation model refs
• gateway models.providers config, when the lane needs config injection
• model runtime params such as SSE transport, fast mode, or thinking defaults
• optional local server startup for mock lanes
• optional placeholder auth profile providers for mock lanes
• whether the lane uses real provider plugins and live environment aliases

Shared suite code should import only providers/index.ts and ask the selected provider for behavior. Do not add provider-name branches to suite, gateway, manual-lane, or live-transport runtime code unless the registry contract is missing a needed capability.