Fix reasoning token streaming for gpt-5-mini and gpt-5-nano models

[Mark-Life]

Fix reasoning token streaming for gpt-5-mini and gpt-5-nano models

Fixes #92

🎯 Changes

Type definitions:

• Added OpenAIReasoningOptions to gpt-5-mini and gpt-5-nano model type definitions in model-meta.ts
• Fixed summary option placement in OpenAIReasoningOptions - moved inside reasoning object to match OpenAI SDK structure

Runtime streaming:

• Added handler for response.reasoning_summary_text.delta events in openai-adapter.ts to stream reasoning summaries

Tests:

• Updated model-meta.test.ts to expect reasoning support for gpt-5-mini and gpt-5-nano

Docs:

• Updated docs/adapters/openai.md to include gpt-5-mini and gpt-5-nano in supported reasoning models

✅ Checklist

• I have followed the steps in the Contributing guide. (Note: CONTRIBUTING.md not found in repo)
• I have tested this code locally with pnpm run test:pr.
• I have tested this code locally with pnpm run test:lib.

🚀 Release Impact

• This change affects published code, and I have generated a changeset.
• This change is docs/CI/dev-only (no release).

[nx-cloud]

View your CI Pipeline Execution ↗ for commit 1d34d8e

Command	Status	Duration	Result
nx run-many --targets=build --exclude=examples/**	✅ Succeeded	11s	View ↗
nx affected --targets=test:sherif,test:knip,tes...	✅ Succeeded	36s	View ↗

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☁️ Nx Cloud last updated this comment at 2025-12-05 14:55:55 UTC

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commit: 1d34d8e