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e229d597f2
claude-to-gemini.ts and openai-to-gemini.ts only re-attached a resolved thoughtSignature to the FIRST functionCall of an assistant message, silently dropping it for every subsequent tool_use/tool_calls entry in the same parallel (multi tool-call) turn -- even when a real, previously-stored signature existed for it. Gemini 3.x then rejected the request with HTTP 400 'Function call is missing a thought_signature in functionCall parts'. Each functionCall part now carries its own resolved thoughtSignature unconditionally, instead of only the first one in the message. Regression tests: tests/unit/issue-11510-parallel-tool-thought-signature.test.ts (claude-to-gemini) and tests/unit/issue-11510-parallel-tool-thought-signature-openai.test.ts (openai-to-gemini), both proven RED against unfixed code and GREEN after the fix.