Fixes review comments.

hardware/sp1_insert/sp1_insert.kicad_dru

@@ -0,0 +1,23 @@
+(version 1)
+
+# SP1 gold fingers must reach the board edge to contact the GameCube slot,
+# so copper-to-edge clearance is intentionally relaxed for the connector
+# footprint only. By design, not a defect. Mirrors the identical rule in
+# ../re-bba-rb/re-bba-rb.kicad_dru for J3.
+(rule "SP1 gold fingers - allow copper to board edge"
+	(condition "A.memberOfFootprint('J1') || B.memberOfFootprint('J1')")
+	(constraint edge_clearance (min -0.5mm)))
+
+# JLCPCB manufacturing floor (same tier as the main board).
+(rule "JLCPCB min copper clearance (0.09mm)"
+	(severity error)
+	(constraint clearance (min 0.09mm)))
+(rule "JLCPCB min via/PTH drill (0.15mm)"
+	(severity error)
+	(constraint hole_size (min 0.15mm)))
+(rule "JLCPCB min via pad diameter (0.25mm)"
+	(severity error)
+	(constraint via_diameter (min 0.25mm)))
+(rule "JLCPCB min hole-to-hole spacing (0.2mm)"
+	(severity error)
+	(constraint hole_to_hole (min 0.2mm)))