Add API Error annotations to GitHub issue errors

[omgitsads]

Add error wrappers to errors returned from the GitHub API and GitHub GraphQL API

[Copilot]

Pull request overview

This PR adds error annotation wrappers to errors returned from the GitHub API and GraphQL API in the issues functionality. The changes introduce a new helper function NewGitHubGraphQLErrorToCtx and apply error wrapping patterns to several error handling locations in the issues code.

Key Changes:

• Added NewGitHubGraphQLErrorToCtx function in pkg/errors/error.go to add GraphQL errors to context
• Updated error handling in CreateIssue, ListIssues, and AssignCopilotToIssue to use new error wrapper functions

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 1 comment.

File	Description
pkg/errors/error.go	Added NewGitHubGraphQLErrorToCtx function to store GraphQL errors in context, following the pattern of the existing NewGitHubAPIErrorToCtx function
pkg/github/issues.go	Updated error handling in multiple functions to use NewGitHubAPIErrorResponse and NewGitHubGraphQLErrorResponse for consistent error annotation

[Copilot]

The error at line 1664 is inconsistently handled compared to other GraphQL errors in this file. This code uses NewGitHubGraphQLErrorToCtx which only adds the error to the context, but then returns the raw error without wrapping it in a tool result.

This is inconsistent with other error handling patterns in this function (e.g., line 1711) and throughout the file. The function should return a *mcp.CallToolResult as the first return value when an error occurs, not nil.

Consider changing this to:

return ghErrors.NewGitHubGraphQLErrorResponse(ctx, "failed to get suggested actors", err), nil, nil

This matches the pattern used at line 1711 and other locations in the file.

Suggested change

	_, _ = ghErrors.NewGitHubGraphQLErrorToCtx(ctx, "failed to get suggested actors", err)
	return nil, nil, err
	return ghErrors.NewGitHubGraphQLErrorResponse(ctx, "failed to get suggested actors", err), nil, nil