Serialize structured realtime tool outputs as JSON

[lavish0000]

Summary

• serialize structured realtime tool results to JSON instead of stringifying Python objects
• keep plain string outputs unchanged while handling Pydantic models and dataclasses predictably
• add regression coverage for dict and model-based tool return values

Test plan

• make sync
• make format
• make lint
• make mypy
• make tests

Issue number

Closes #1847

Checks

• I've added new tests (if relevant)
• I've added/updated the relevant documentation
• I've run make lint and make format
• I've made sure tests pass

[chatgpt-codex-connector]

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Reviewed commit: 5e47832388

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[seratch]

Thanks for sending this patch. The change could resolve the issue, but could you repeat Codex's reviews by fixing the comments and then @codex review again until you get 👍 from Codex?

[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit: 5e47832388

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[lavish0000]

@codex review again

[lavish0000]

@codex review

[lavish0000]

@codex review again

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. Breezy!

ℹ️ About Codex in GitHub

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[chatgpt-codex-connector]

💡 Codex Review

Here are some automated review suggestions for this pull request.

Reviewed commit: 6abc0de11b

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

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[lavish0000]

@codex review

[lavish0000]

@codex review again

[chatgpt-codex-connector]

Codex Review: Didn't find any major issues. More of your lovely PRs please.

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
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• Comment "@codex review".

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[seratch]

LGTM