AWS Bedrock Converse API transport adapter.

Auth: AWS Signature V4 — sdk/complete dispatches on
:profile/auth-strategy :aws-sigv4 and signs the request via
llm.sdk.aws-sigv4 just before the HTTP send.

Streaming: Bedrock's /converse-stream emits binary event-stream
frames (vnd.amazon.eventstream). sdk/complete reads the raw
InputStream via llm.sdk.aws-eventstream/frame-seq and hands
each parsed frame to parse-stream-event-bedrock as a map.

Model-id mapping: canonical short ids (e.g. claude-sonnet-4-5,
nova-pro) are mapped to Bedrock's region-versioned id format
(e.g. anthropic.claude-sonnet-4-5-20250101-v1:0); unknown ids
pass through verbatim so callers can provide explicit ARNs.

Bedrock Runtime image-generation adapter.

Amazon Titan Image Generator and Nova Canvas use the taskType /
imageGenerationConfig request family. Stability SDXL uses the legacy
text_prompts/artifacts contract, while Stable Image Core, Ultra, and
SD3.5 use the prompt/images contract. All models are invoked through
/model/{modelId}/invoke with SigV4.

Bedrock Agent Runtime /rerank adapter.

Canonical SDK rerank requests follow Cohere-style inputs:
{model, query, documents, top-n}. Bedrock expects an Agent Runtime
request containing queries, sources, and a Bedrock reranking
configuration. The request is signed by llm.sdk.rerank via SigV4.