- Introduced tests for `ConvertOpenAIRequestToGemini`, `ConvertOpenAIResponsesRequestToGemini`, and related Claude functions to ensure trailing model-prefill turns are removed. - Enhanced tool call ID handling with `util.SanitizeClaudeToolID` to standardize IDs in Claude-related conversions and tests. - Updated logic in Gemini and Claude translators to handle edge cases for trailing assistant prefill and tool ID sanitization, ensuring compatibility across input variants. Closes: #3113