Fix go fmt failure in CreatePullRequestsConfig

[Copilot]

Bug Fix

The referenced CI job failed at the Go formatting gate (go fmt ./...). The failure was caused by formatting drift in pkg/workflow/create_pull_request.go, which prevented the Go lint workflow from completing.

What was the bug?

• Formatting drift in Go source
  • CreatePullRequestsConfig had spacing not aligned with gofmt output, causing fmt-check to fail.

How did you fix it?

• Applied canonical gofmt formatting
  • Updated the struct field line formatting in pkg/workflow/create_pull_request.go to match standard Go formatter output.
• Scope kept minimal
  • No behavior, API, or configuration logic changes; only formatting normalization.

Testing

• Formatting gate alignment
  • Change is limited to formatting compliance for the Go lint/fmt path.

BranchPrefix string `yaml:"branch-prefix,omitempty"` // Optional prefix for the pull request branch name (e.g. "signed/"). Applied before the agent-specified or auto-generated branch name.

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