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Anthropic extended thinking blocks include an opaque 'signature' field required for thinking chain continuity across multi-turn tool-use conversations. Previously, normalize_anthropic_response() extracted only the thinking text and set reasoning_details=None, discarding the signature. On subsequent turns the API could not verify the chain. Changes: - _to_plain_data(): new recursive SDK-to-dict converter with depth cap (20 levels) and path-based cycle detection for safety - _extract_preserved_thinking_blocks(): rehydrates preserved thinking blocks (including signature) from reasoning_details on assistant messages, placing them before tool_use blocks as Anthropic requires - normalize_anthropic_response(): stores full thinking blocks in reasoning_details via _to_plain_data() - _extract_reasoning(): adds 'thinking' key to the detail lookup chain so Anthropic-format details are found alongside OpenRouter format Salvaged from PR #4503 by @priveperfumes — focused on the thinking block continuity fix only (cache strategy and other changes excluded).