feat: add summary field and serializer

[PeterStaar-IBM]

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[github-actions]

✅ DCO Check Passed

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[mergify]

Merge Protections

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🔴 Require two reviewer for test updates

This rule is failing.

When test data is updated, we require two reviewers

• #approved-reviews-by >= 2

🟢 Enforce conventional commit

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Make sure that we follow https://www.conventionalcommits.org/en/v1.0.0/

• title ~= ^(fix|feat|docs|style|refactor|perf|test|build|ci|chore|revert)(?:\(.+\))?(!)?:

[dosubot]

Related Documentation

Checked 2 published document(s). No updates required.

^{You have 5 draft document(s). Publish docs to keep them always up-to-date}

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[codecov]

Codecov Report

❌ Patch coverage is 92.50000% with 9 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
...g_core/experimental/serializer/markdown_summary.py	92.43%	9 Missing ⚠️

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