fix: recover text from completed Responses events

[jan-kubica]

Summary

• recover successful OpenAI Responses text when it is only present on response.completed
• ignore empty response.content_part.added placeholders so they do not suppress the completion fallback
• cover the behavior at both the adapter and raw-wire E2E boundaries

Root cause

The Responses adapter treated an empty output_text content-part placeholder as streamed content. Some successful responses then carry the populated text only in response.completed.output, but that terminal payload was not used as a backstop. Non-streaming callers consequently received an empty string for a successful response.

Test plan

• pnpm --filter @tanstack/openai-base test:lib -- responses-text.test.ts
• pnpm test:pr
• pnpm --filter @tanstack/ai-e2e test:e2e -- tests/openai-completed-response-text.spec.ts
• pnpm --filter @tanstack/ai-e2e test:e2e (345 passed, 1 gated live smoke skipped; 4 unrelated tests passed on retry)

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