Modify existing workflows from natural language

[structbinary]

Currently CI-Copilot only generates new pipelines. This issue tracks adding the ability to modify existing workflows through conversation.

Examples

• "Add a security scanning stage to our CI pipeline"
• "Change the Node version from 18 to 20 in our build workflow"
• "Add a deploy step that only runs on the main branch"
• "Remove the coverage upload step"

What needs to happen

• Parse and understand existing workflow files (YAML → internal representation)
• Accept modification instructions in natural language
• Apply targeted changes without rewriting the entire file
• Validate the modified output the same way new workflows are validated
• Present a diff to the user for approval before committing

Considerations

• This needs to work across CI platforms (platform-agnostic modification)
• Must preserve comments, formatting, and structure in the original file where possible
• Human-in-the-loop approval is critical here — modifying production pipelines is higher risk than generating new ones