Integrate Measured ESP32 PCB Geometry

- Add measured F.Fab bounds and USB mouth markers
- Add guarded preservation and regression validation
- Refresh review exports and remove draft presentation labels

hardware/PCB/validate_footprints.py

@@ -117,9 +117,23 @@ class FootprintRegression(unittest.TestCase):
             for row, x in enumerate((0, 25.4)) for index in range(22)
         }
         self.check_header(footprint, positions)
-        self.assertFalse(any(isinstance(g, k.PCB_SHAPE)
-                             for g in footprint.GraphicalItems()),
-                         "HW678 must not acquire guessed outlines or envelopes")
+        shapes = [g for g in footprint.GraphicalItems() if isinstance(g, k.PCB_SHAPE)]
+        expected = [
+            (k.SHAPE_T_RECT, mm(-1.365, -1.365), mm(26.725, 54.705), k.FromMM(0.1)),
+            (k.SHAPE_T_RECT, mm(4.045, -8.255), mm(21.675, -1.365), k.FromMM(0.1)),
+            (k.SHAPE_T_SEGMENT, mm(2.795, 54.705), mm(11.665, 54.705), k.FromMM(0.3)),
+            (k.SHAPE_T_SEGMENT, mm(14.195, 54.705), mm(23.065, 54.705), k.FromMM(0.3)),
+        ]
+        self.assertEqual(Counter((g.GetShape(), xy(g.GetStart()), xy(g.GetEnd()),
+                                  g.GetWidth()) for g in shapes), Counter(expected))
+        for shape in shapes:
+            self.assertEqual(shape.GetLayer(), k.F_Fab)
+            self.assertFalse(shape.IsAnyFill())
+        # Only measured planar bounds/mouth spans: no invented shell depth or RF area.
+        self.assertAlmostEqual(26.725 - (-1.365), 28.09)
+        self.assertAlmostEqual(54.705 - (-1.365), 56.07)
+        self.assertAlmostEqual(54.705 - (-8.255), 62.96)
+        self.assertAlmostEqual(26.725 - 25.4, 1.325)
 
 
 if __name__ == "__main__":