AI Refinement: Parse errors occur with large workflow changes

[breaking-brake]

What happened?

When the AI attempts to make substantial modifications to the workflow, parse errors are more likely to occur.

• The AI response may not be properly parsed as valid workflow JSON
• Larger/more complex changes have higher failure rates
• Users cannot reliably make significant workflow restructuring via AI

Steps to reproduce

1. Open a complex workflow (10+ nodes)
2. Request significant changes via AI refinement (e.g., "restructure the entire flow")
3. Parse error may occur when AI returns modified workflow

Expected behavior

Large changes should be parsed correctly without errors. The AI should return valid workflow JSON regardless of the scope of changes.

Extension version

3.12.6

Operating System

All platforms (macOS, Windows, Linux)

Relevant log output

Not captured yet - will update if specific errors are reproduced

[breaking-brake]

Resolved by #446.

Root cause: AI was outputting multiple separate JSON blocks instead of a single combined response.

Fix: PR #446 enforced single JSON output format in the prompt with:

• Explicit requirement for ONE JSON object
• Prohibition of explanatory text and markdown code blocks
• Concrete examples showing correct values.workflow nesting