[awf] api-proxy/copilot: COPILOT_PROVIDER_WIRE_API not set for GPT-5 models in BYOK/offline mode #2802

Problem

Sandboxed engine: copilot workflows fail with GPT-5-family models because the AWF compiler injects COPILOT_API_KEY: dummy-byok-key-for-offline-mode to force BYOK/offline mode, but does not set COPILOT_PROVIDER_WIRE_API=responses. GPT-5 models require the responses API wire format; without it, all inference calls fail.

Context

Original issue: github/gh-aw#31241

Root Cause

In src/services/api-proxy-service.ts, when copilotApiKey is present the code sets COPILOT_OFFLINE=true and COPILOT_PROVIDER_BASE_URL but does not conditionally set COPILOT_PROVIDER_WIRE_API based on the selected COPILOT_MODEL. containers/api-proxy/providers/copilot.js forwards requests without enforcing the wire API version.

Proposed Solution

In src/services/api-proxy-service.ts, detect models that require the responses wire API (e.g. any gpt-5* model) via COPILOT_MODEL env var, and inject COPILOT_PROVIDER_WIRE_API=responses into the agent environment when applicable. Alternatively, always forward COPILOT_PROVIDER_WIRE_API from the outer workflow environment into the agent container.

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