Add panel-to-PCB mounting system with M3 standoffs

Panel alignment:
- PCB offset 10mm from panel top
- Component holes aligned: OLED@25mm, jacks@45mm, button@58mm
- 4x M3 standoff holes at corners (5,5), (35,5), (5,75), (35,75)

Updates:
- Panel SVG and spec aligned with PCB layout
- Mounting holes added to PCB (Edge.Cuts layer)
- Regenerated Gerbers with mounting holes
- Updated autoroute.py to add mounting holes automatically

DRC: 0 unconnected, 7 cosmetic errors (courtyard overlaps)

hardware/kicad/scripts/autoroute.py

@@ -33,6 +33,15 @@ DRC_FILE = "DRC.rpt"
 FREEROUTING_JAR = "/tmp/freerouting.jar"
 FREEROUTING_URL = "https://github.com/freerouting/freerouting/releases/download/v2.0.1/freerouting-2.0.1.jar"
 
+# Mounting hole positions (M3, 3.2mm diameter)
+# Bottom holes moved up to avoid power section
+MOUNTING_HOLES = [
+    (5, 5),      # Top left
+    (35, 5),     # Top right
+    (5, 75),     # Bottom left (above power section)
+    (35, 75),    # Bottom right (above power section)
+]
+
 # Component positions for 8HP (40mm x 100mm) layout v2
 PLACEMENTS = {
     # Top - OLED display
@@ -124,6 +133,29 @@ def main():
             placed += 1
     print(f"  Placed {placed} components")
 
+    # Step 4b: Add mounting holes
+    print("\n[4b/9] Adding mounting holes...")
+    # Remove existing mounting holes first
+    for drawing in list(board.GetDrawings()):
+        if drawing.GetClass() == "PCB_SHAPE":
+            if drawing.GetShape() == pcbnew.SHAPE_T_CIRCLE:
+                # Check if it's a mounting hole (on Edge.Cuts, 3.2mm diameter)
+                if drawing.GetLayer() == pcbnew.Edge_Cuts:
+                    radius = pcbnew.ToMM(drawing.GetRadius())
+                    if 1.5 < radius < 1.7:  # ~3.2mm diameter
+                        board.Delete(drawing)
+
+    # Add new mounting holes
+    for x, y in MOUNTING_HOLES:
+        hole = pcbnew.PCB_SHAPE(board)
+        hole.SetShape(pcbnew.SHAPE_T_CIRCLE)
+        hole.SetCenter(place(x, y))
+        hole.SetEnd(place(x + 1.6, y))  # Radius = 1.6mm (3.2mm diameter)
+        hole.SetLayer(pcbnew.Edge_Cuts)
+        hole.SetWidth(mm(0.15))
+        board.Add(hole)
+    print(f"  Added {len(MOUNTING_HOLES)} mounting holes (M3, 3.2mm)")
+
     # Step 5: Export DSN
     print("\n[5/9] Exporting Specctra DSN...")
     board.Save(PCB_FILE)  # Save first