Remove the non-beneficial runtime error

errors.go

@@ -8,11 +8,3 @@ type InvalidEntrypointError struct{ Entrypoint string }
 func (e InvalidEntrypointError) Error() string {
 	return fmt.Sprintf("entrypoint %q does not exist", e.Entrypoint)
 }
-
-// EntrypointRuntimeError is a generic error for everything that happens during runtime.
-type EntrypointRuntimeError struct{ inner error }
-
-func (e EntrypointRuntimeError) Error() string {
-	return fmt.Sprintf("e5e unexpected runtime error: %s", e.inner.Error())
-}
-func (e EntrypointRuntimeError) Unwrap() error { return e.inner }

mux.go

@@ -97,7 +97,7 @@ func (m *Mux) Start(ctx context.Context, args []string) error {
 	if m.Options == nil {
 		opts, err := parseArguments(args)
 		if err != nil {
-			return EntrypointRuntimeError{err}
+			return fmt.Errorf("go-e5e: parsing arguments failed: %w", err)
 		}
 
 		m.Options = &opts
@@ -144,7 +144,7 @@ func (m *Mux) Start(ctx context.Context, args []string) error {
 	for line := range lineChan {
 		response, err := m.execute(ctx, line)
 		if err != nil {
-			return EntrypointRuntimeError{err}
+			return fmt.Errorf("go-e5e: handler execution: %w", err)
 		}
 
 		_, _ = fmt.Fprint(m.Stdout, m.Options.StdoutExecutionSequence)