bare-high/gpt-5 / tier-2-offset-handle-mug

```openscad
// Parameters
$fn = 128;

outer_d = 80;
inner_d = 70;
height = 90;
bottom_thickness = 6;
outer_r = outer_d/2;
inner_r = inner_d/2;

handle_inner_h = 30;   // inner void height
handle_inner_w = 25;   // inner void width
handle_t       = 6;    // handle ring thickness
handle_depth   = 16;   // handle thickness along Y
handle_embed   = 1.0;  // embed into mug wall for solid union

eps = 0.2;

// 2D D-shape in XY (flat side at x=0, centered in Y)
module d_shape2d(w, h) {
    R = h/2;
    union() {
        translate([0, -R]) square([w - R, h], center = false);
        translate([w - R, 0]) circle(r = R);
    }
}

// 3D handle placed on +X side, centered in Z
module handle3d() {
    w_o = handle_inner_w + 2*handle_t;
    h_o = handle_inner_h + 2*handle_t;

    translate([outer_r - handle_embed, 0, height/2])
        rotate([-90, 0, 0])  // extrude along Y
            linear_extrude(height = handle_depth, center = true, convexity = 10)
                difference() {
                    d_shape2d(w_o, h_o);
                    translate([handle_t, 0]) d_shape2d(handle_inner_w, handle_inner_h);
                }
}

// Mug with handle
difference() {
    union() {
        // Outer mug body
        cylinder(r = outer_r, h = height);
        // D-shaped handle on +X side
        handle3d();
    }
    // Hollow interior, leaving 6mm bottom
    translate([0, 0, bottom_thickness])
        cylinder(r = inner_r, h = height - bottom_thickness + eps);
}
```