chore: add startup log line to trigger PR coverage comment

Touches an executed line in Run() so the dogfooded pr-code-coverage
workflow has a covered Go change to report on.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: CodeYogiCo

internal/plugin/runner.go

@@ -28,6 +28,8 @@ func NewRunner() *DefaultRunner {
 // nolint: gocyclo
 func (*DefaultRunner) Run(propertyGetter func(string) (string, bool), changedSourceLinesSource io.Reader, reportDefaultOut io.Writer) error {
 
+	logrus.Info("starting pull-request-code-coverage run")
+
 	rawSourceDirs, found := propertyGetter("PARAMETER_SOURCE_DIRS")
 	if !found {
 		return errors.New("Missing property PARAMETER_SOURCE_DIRS")