[api-sync 2026-07-22] gradientlabs-dotnet: sync to OpenAPI spec

[jafrog]

Summary

Adds Customers.BatchCreateMemoriesAsync to the Integration client for batch-creating customer-scoped memories that the agent can search over on demand.

Task BatchCreateMemoriesAsync(
    string customerId,
    BatchCreateMemoriesRequest request,
    CancellationToken cancellationToken = default)

• Endpoint: POST /customers/{customer_id}/memories (Integration role).
• Customer-scoped, not conversation-scoped — the path param is the customer id.
• Request (BatchCreateMemoriesRequest): Memories, a non-empty IReadOnlyList<Memory>. Each Memory carries:
  • ExternalId (required, wire external_id) — the caller's own id for the memory
  • CustomType (optional, wire custom_type, omitted when null) — free-form label
  • CreatedAt (required, wire created_at) — RFC3339 timestamp
  • Data (required, JsonElement, wire data) — arbitrary JSON object stored verbatim
• Response: none. The call is asynchronous (fire-and-forget) and returns a plain Task with no body — it does not return an upload id or an inserted count.
• Errors: propagated through the existing GradientLabsApiException. In particular the endpoint returns 409 Conflict when a batch is already being created for the same customer; no special client handling is needed beyond the generic error propagation.

Why the rework

This PR previously added the conversation-scoped bulk-upload endpoint (Conversations.BulkUploadMemoriesAsync, BulkUploadMemoriesRequest/BulkUploadMemoriesResponse, with idempotency_key / *_keys fields and an upload_id / memories_inserted response). That endpoint was never released and has been replaced server-side by the customer-scoped batch-create above. The old method and its request/response types are removed.

Changes

• Add CustomersClient resource group on GradientLabsIntegrationClient (client.Customers).
• Add BatchCreateMemoriesRequest and Memory models.
• Remove Conversations.BulkUploadMemoriesAsync and the old request/response types.
• Update MemoriesTests: path/method assertions (POST /customers/{id}/memories), snake_case body, custom_type omitted when null, and API error propagation including 409 Conflict.

Version stays at 0.2.0 (first release of this endpoint; minor bump). dotnet build, dotnet test (75 passed on net8.0 and net10.0), and dotnet format --verify-no-changes all pass.