Fix: DIP package diagrams misaligned in non-monospace renderers (phones, some markdown viewers) because the pin-1 notch used an ambiguous-width glyph (◡). The notch is now TTY-aware, it stays ◡ on a real terminal (via the same auto-detection as --color) and falls back to a single-width ASCII u when output is piped, redirected, or captured. Terminal output is unchanged; captured output now aligns everywhere. No new flags.