chore: bump bedrock models

[joanagmaia]

Note

Medium Risk
Model and region changes can alter LLM outputs, latency, and cost, which may affect merge/enrichment decisions even though the code changes are small and localized.

Overview
Updates Amazon Bedrock usage across services to target Claude Sonnet 4.5 (us.anthropic.claude-sonnet-4-5-20250929-v1:0) instead of the previous Claude Sonnet 4 / Claude 3.5 defaults.

Merge-suggestions Temporal workflows also switch the Bedrock region from us-east-1 to us-west-2 and stop hardcoding model strings by using the shared LlmModelType enum. The shared types library adds the new CLAUDE_SONNET_4_5 model, wires it into region/pricing maps, and updates multiple LLM_SETTINGS query defaults to use it.

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