Add note on using defaultValue with a json code field

[andrewmumblebee]

📋 Summary

As Dave noted, the agent can sometimes use a string defaultValue for a code input, which causes issues with the json language option. It double encoding the object string, rather than rendering as a JSON object in the editor.

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🔍 Scope of change

• Documentation only
• Repository metadata or configuration
• CI / automation
• Other (please describe):

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📚 Checklist

• I agree to the Code of Conduct

Summary by CodeRabbit

• Documentation
  • Added a warning explaining that JSON editor defaults must be provided as an object, not a string.
  • Included a clearer example showing the correct JSON defaultValue format.

[github-actions]

🧩 Plugin PR Summary

ℹ️ No plugins were modified in this PR.

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Repository UI (base), Organization UI (inherited)

Review profile: ASSERTIVE

Plan: Pro

Run ID: d051f6c5-d5c4-472b-9d35-f4ea545ffe2c

📥 Commits

Reviewing files that changed from the base of the PR and between eb6d864 and 214ee7b.

📒 Files selected for processing (1)

• .claude/skills/build-plugin/references/ui.md

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📝 Walkthrough

Walkthrough

This change updates documentation in ui.md to clarify that when a code field's language is set to "json", the defaultValue must be a JSON object rather than a string, since the editor stringifies the object. A JSON example is included.

Changes

Documentation Update

Layer / File(s)	Summary
Code field documentation update .claude/skills/build-plugin/references/ui.md	Adds a warning and example clarifying that defaultValue must be a JSON object (not a string) when language is "json".

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly states the documentation note about defaultValue for JSON code fields.
Description check	✅ Passed	The description includes a summary, scope, and checklist, which is sufficient for this documentation-only change.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

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