* fix: handle system messages with mixed TextContent + ImageContent
System messages injected by external tools (e.g. packify.ai MCP) can
contain both TextContent and ImageContent. The assertions in
to_openai_responses_dicts and to_anthropic_dict expected exactly one
TextContent, causing AssertionError in production.
Extract all text parts and join them, matching how to_openai_dict
already handles this case.
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Co-Authored-By: Letta <noreply@letta.com>
* fix: replace asserts with logger.warning + graceful skip
Asserts are the wrong tool for production input validation — if a
system message has only non-text content, we should warn and skip
rather than crash the request.
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Co-Authored-By: Letta <noreply@letta.com>
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Co-authored-by: Letta <noreply@letta.com>
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