fix(ai): reject malformed OpenAI tool calls

[woodgear]

Summary

• Reject malformed OpenAI-compatible streamed tool calls that finish without an id or function name.
• Remove malformed tool calls from error results so they cannot be persisted into session history.
• Add regression coverage for missing tool call id and missing function name.

Testing

• cd packages/ai && node ../../node_modules/vitest/dist/cli.js --run test/openai-completions-malformed-tool-call.test.ts
• cd packages/ai && node ../../node_modules/vitest/dist/cli.js --run test/openai-completions-tool-choice.test.ts
• npm run check

[github-actions]

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