chore: bump bedrock models to sonnet-4.5

[joanagmaia]

Note

Medium Risk
Changes the underlying LLM model and Bedrock region for multiple production workflows, which can alter output quality/behavior and has potential availability/latency implications, but is configuration-scoped with minimal logic changes.

Overview
Upgrades Amazon Bedrock model usage to Claude Sonnet 4.5 (us.anthropic.claude-sonnet-4-5-20250929-v1:0) across the codebase, including crowdgit’s invoke_bedrock and the Temporal merge-suggestion workflows.

Introduces LlmModelType.CLAUDE_SONNET_4_5 and wires it into shared LLM_SETTINGS, plus adds region/pricing mappings; merge workflows also switch from hardcoded model IDs to the enum and move execution to us-west-2.

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[skwowet]

Just left a comment about the region prefix, but LGTM overall.

[skwowet]

Don’t we need the us region prefix here?

Maybe we can test it with curl to confirm.

[joanagmaia]

@skwowet updated. Also ran the curl and returned with a valid response

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