Shadow Nametag Fix

v2.0.0

Rewrote shadow pass detection: now uses Iris's own ShadowRenderingState.areShadowsCurrentlyBeingRendered() via MethodHandle instead of checking the projection matrix Previous approach (RenderSystem.getProjectionMatrix().m33()) was unreliable because Iris does not update RenderSystem's projection matrix during the shadow pass — causing the fix to silently do nothing ~50% of the time Fix now triggers consistently regardless of shader pack version, shader settings, or render order No Iris hard dependency — graceful fallback if Iris is not installed