fix: address review feedback

- Document GraphQLFeaturesTransport is for library consumers
- Convert githubv4.Int/String to native Go types in result map
- Remove misleading log comment since tool handlers lack logger access

Author: SamMorrowDrums

pkg/github/issues.go

@@ -1927,7 +1927,7 @@ func AssignCopilotToIssue(t translations.TranslationHelperFunc) inventory.Server
 
 				pr, err := findLinkedCopilotPR(ctx, client, params.Owner, params.Repo, int(params.IssueNumber), assignmentTime)
 				if err != nil {
-					// Log but don't fail - polling errors are non-fatal
+					// Polling errors are non-fatal, continue to next attempt
 					continue
 				}
 				if pr != nil {
@@ -1939,8 +1939,8 @@ func AssignCopilotToIssue(t translations.TranslationHelperFunc) inventory.Server
 			// Build the result
 			result := map[string]any{
 				"message":      "successfully assigned copilot to issue",
-				"issue_number": updateIssueMutation.UpdateIssue.Issue.Number,
-				"issue_url":    updateIssueMutation.UpdateIssue.Issue.URL,
+				"issue_number": int(updateIssueMutation.UpdateIssue.Issue.Number),
+				"issue_url":    string(updateIssueMutation.UpdateIssue.Issue.URL),
 				"owner":        params.Owner,
 				"repo":         params.Repo,
 			}

pkg/github/transport.go

@@ -9,6 +9,10 @@ import (
 // header to requests based on context values. This is required for using
 // non-GA GraphQL API features like the agent assignment API.
 //
+// This transport is exported for use by library consumers who need to build
+// their own HTTP clients with GraphQL feature flag support. The MCP server
+// itself uses an inline implementation in its transport stack.
+//
 // Usage:
 //
 //	httpClient := &http.Client{