Initial BinaryLane v2 API client

docs/api-coverage.md

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+# Maintainer guide: API coverage
+
+This is a maintainer reference. Package consumers can start with the
+[README](../README.md).
+
+The SDK's scope is the BinaryLane v2 OpenAPI contract committed at
+`eng/openapi/binarylane-v2.openapi.yaml`. The raw contract currently declares
+version `0.39.1`; it is a developer-preview contract and may change without a
+version change.
+
+The raw document contains virtual paths such as
+`/v2/servers/{server_id}/actions#PowerOn`. These are API-reference aliases for
+action payload variants, not real HTTP routes. Coverage and generated-code
+checks must use the normalized contract and count only the real
+`POST /v2/servers/{server_id}/actions` route.
+
+| API area | Public resource boundary |
+| --- | --- |
+| Account | `IAccountApi` |
+| Balances, invoices, and unpaid invoices | `IBillingApi` |
+| Actions | `IActionsApi` |
+| Servers and server subresources | `IServersApi` |
+| Images | `IImagesApi` |
+| SSH keys | `ISshKeysApi` |
+| DNS domains, nameservers, and records | `IDomainsApi` |
+| Load balancers and forwarding rules | `ILoadBalancersApi` |
+| VPCs and members | `IVpcsApi` |
+| Regions, sizes, and software catalogues | `IRegionsApi`, `ISizesApi`, `ISoftwareApi` |
+| Reverse names | `IReverseNamesApi` |
+| Data usage | `IDataUsageApi` |
+| Sample sets | `ISampleSetsApi` |
+
+Keep this table and the related tests up to date when API support changes.