PCB: insert MDI dampers R32-R35 in-line and place C20/C21 at J2 center taps

Insertion by Dennis; reviewed:
- DRC 0 errors / 0 unconnected / 0 schematic parity
- R32-R35 sit in-line between the termination cluster and D4/D5, each
  aligned to its own line row; MDI_* stubs only 1.45-1.48mm, no new
  vias, all pair copper at the ETH_DP 0.2mm width
- Pair skew after insertion: TX 0.66mm, RX 1.81mm - both far inside
  the 100BASE-TX budget
- C20/C21 placed against J2's pin column, about as close as the In1
  plane void allows while keeping short GND vias

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

hardware/re-bba-rb/re-bba-rb.kicad_pro

@@ -664,22 +664,6 @@
         "netclass": "ETH_DP",
         "pattern": "*ETH_RX_N*"
       },
-      {
-        "netclass": "ETH_DP",
-        "pattern": "*MDI_TX_P*"
-      },
-      {
-        "netclass": "ETH_DP",
-        "pattern": "*MDI_TX_N*"
-      },
-      {
-        "netclass": "ETH_DP",
-        "pattern": "*MDI_RX_P*"
-      },
-      {
-        "netclass": "ETH_DP",
-        "pattern": "*MDI_RX_N*"
-      },
       {
         "netclass": "ETH_DP",
         "pattern": "*PHY_TX_P*"