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The Copilot API enforces per-account prompt token limits (128K individual, 168K business) that differ from the static 200K context length advertised by the proxy. This mismatch caused Claude Code to accumulate context beyond the actual limit, triggering "prompt token count exceeds the limit of 128000" errors. Changes: - Extract max_prompt_tokens and max_output_tokens from the Copilot /models API response (capabilities.limits) and use them as the authoritative ContextLength and MaxCompletionTokens values - Add CopilotModelLimits struct and Limits() helper to parse limits from the existing Capabilities map - Fix GitLab Duo context-1m beta header not being set when routing through the Anthropic gateway (gitlab_duo_force_context_1m attr was set but only gin headers were checked) - Fix flaky parallel tests that shared global model registry state