The arm selecting the DynamoDB adapter over the AWS SDK v3 client.
options.region is required by the union unless options.client is
supplied, so a registration that forgets both is a compile error instead of
a connect() throw — the same guarantee the 'custom' arm gives
adapter. The client is supplied inject-or-lazy (§12.2 of AI_GUIDELINES):
client is an already-constructed structural IDynamoClient,
and absent it the adapter performs a literal
import('npm:@aws-sdk/client-dynamodb@^3') at connect time.
readonly
type: "dynamodb"
Selects the DynamoDB arm.
readonly
options: DynamoAdapterOptions
DynamoDB adapter configuration; region (or client) is required.