OpenRouter: GA client.responses is not traced by wrap_openrouter(), and client.beta.responses is not auto-instrumented #860

In current openrouter releases (1.2.32 and 1.3.22), client.responses is the GA openrouter.responses.Responses, while client.beta.responses is a separate, deprecated openrouter.beta_responses.BetaResponses.

• wrap_openrouter() in py/src/braintrust/integrations/openrouter/tracing.py only wraps client.beta.responses, so GA client.responses.send / send_async calls are never traced on wrapped clients.
• auto_instrument() patches the GA Responses class but not BetaResponses, so client.beta.responses.send is never traced there.

Fix

• In py/src/braintrust/integrations/openrouter/patchers.py, add patchers for BetaResponses.send / send_async, applied only when openrouter.beta_responses exists (so 0.6.0 keeps working).
• Make wrap_openrouter() also wrap client.responses.
• Add a cassette-backed client.responses.send test, and a Responses check in test_auto_openrouter.py (it only covers chat today).
• Optional: add the new alignment field to _RESPONSES_RESPONSE_KEYS.

Parent: #858 (found while reviewing the 2026-10-05 weekly dependency update, #849).

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