fix: close workspace preprocessing contract gaps

tools/thothctl/internal/compose/runner.go

@@ -57,6 +57,9 @@ func (r Runner) Run(ctx context.Context, args []string, stdin io.Reader) (Result
 // RunBounded streams each pipe into a preallocated fixed-capacity collector. It owns the
 // process group and tears it down on the first overflow or cancellation.
 func (r Runner) RunBounded(ctx context.Context, args []string, stdin io.Reader, limits CaptureLimits) (Result, error) {
+	if result, handled, err := runBoundedPlatform(ctx, r, args, stdin, limits); handled {
+		return result, err
+	}
 	if limits.StdoutBytes < 0 || limits.StderrBytes < 0 {
 		return Result{}, ErrOutputLimit
 	}