feat: add GitHub Copilot provider with per-user token authentication #137
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## Description Fixes a nil pointer dereference when extracting Actor ID for trace attributes. Discovered while testing the Copilot provider implementation (implemented upstack #137), where requests may not always have an actor set in the context. ## Changes Adds `ActorIDFromContext` helper that safely returns an empty string if no actor is present, and updates the interceptors to use it.
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Description
Adds support for GitHub Copilot as an AI provider. Unlike other providers that use a global API key, Copilot uses per-user keys passed in the
Authorizationheader. Copilot's API is OpenAI-compatible, so the provider reuses the existing OpenAI interceptors.Changes
Copilotprovider in with support for:/chat/completionsendpoint/responsesendpoint/models,/agents/,/mcp/InjectAuthHeaderis a no-op since Copilot uses per-user keys from the original requestCloses: coder/internal#1235