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b2b0fafb71
GitHub Copilot's /chat/completions and /responses endpoints never surface prompt-cache token counts (cached_tokens) for Claude models, and round-tripping Claude tool_use/tool_result/thinking content blocks through the OpenAI shape is lossy. Copilot also exposes an Anthropic-native /v1/messages shim that reports cached_tokens correctly and accepts native content blocks as-is. Tag each github registry claude-* model with targetFormat: "claude" so chatCore.ts translates the request to Anthropic-native shape before the executor ever sees it (the same mechanism opencode/zen's Qwen entries and opencode/go already use), and teach the github executor's buildUrl() / buildHeaders() to dispatch those models at the new messagesUrl (api.githubcopilot.com/v1/messages) with the required anthropic-version header. transformRequest() now skips its /chat/completions-only quirks (content-part flattening, trailing-assistant-prefill drop, the response_format-as-system-prompt workaround) for the native path — the first would destroy native tool_use/tool_result blocks, the prefill drop is unnecessary because the real Anthropic API supports assistant prefill, and the response_format workaround is superseded by the generic openai-to-claude translator's own JSON-mode handling. Co-authored-by: luoyide <ydhome.code@gmail.com> Inspired-by: https://github.com/decolua/9router/pull/2608