fix: deserialization of flattened system_cachepoint_config in AmazonBedrockChatGenerator

[tstadel]

Related Issues

• fixes system_cachepoint_config_ttl being deserialized as root level init param, not as generation_kwarg

Proposed Changes:

expect

init_parameters:
  model: global.anthropic.claude-sonnet-4-6
  system_cachepoint_config_ttl: 1h

instead of

init_parameters:
  model: global.anthropic.claude-sonnet-4-6
  generation_kwargs:
    system_cachepoint_config_ttl: 1h

How did you test it?

Notes for the reviewer

Checklist

• I have read the contributors guidelines and the code of conduct
• I have updated the related issue with new insights and changes
• I added unit tests and updated the docstrings
• I've used one of the conventional commit types for my PR title: fix:, feat:, build:, chore:, ci:, docs:, style:, refactor:, perf:, test:.

[github-actions]

Coverage report (amazon_bedrock)

Click to see where and how coverage changed

File	Statements	Missing	Coverage	Coverage (new stmts)	Lines missing
integrations/amazon_bedrock/src/haystack_integrations/components/generators/amazon_bedrock/chat
chat_generator.py
Project Total

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