use usbc port for power; add temp sensor; reroute uart2 to uart4

cm4-nrf54.kicad_prl

@@ -1,6 +1,6 @@
 {
   "board": {
-    "active_layer": 0,
+    "active_layer": 2,
     "active_layer_preset": "",
     "auto_track_width": true,
     "hidden_netclasses": [],
@@ -49,7 +49,7 @@
       "conflict_shadows",
       "shapes"
     ],
-    "visible_layers": "ffffffff_ffffffff_fffffffd_dfff7f27",
+    "visible_layers": "ffffffff_ffffffff_fffffffd_dfff7f37",
     "zone_display_mode": 1
   },
   "git": {

cm4-nrf54.kicad_pro

@@ -59,6 +59,22 @@
         }
       ],
       "drc_exclusions": [
+        [
+          "hole_clearance|93905000|71850000|7f712ede-8248-4bc2-98d9-3812e675d184|3804f7bf-97e6-4aa5-b82b-49b730046c94",
+          ""
+        ],
+        [
+          "hole_clearance|93905000|71850000|7f712ede-8248-4bc2-98d9-3812e675d184|7eacf1a0-46c4-4705-b9ca-fea045d0e0a6",
+          ""
+        ],
+        [
+          "hole_clearance|93905000|77950000|622da226-a224-4b9b-aedd-ac4c91f8ff2e|3e26e8ad-e92c-4178-bbca-594cd3924d79",
+          ""
+        ],
+        [
+          "hole_clearance|93905000|77950000|622da226-a224-4b9b-aedd-ac4c91f8ff2e|43907a71-31f3-440c-8a1f-e6754fa1b949",
+          ""
+        ],
         [
           "lib_footprint_issues|134500000|64000000|00000000-0000-0000-0000-000061456af4|00000000-0000-0000-0000-000000000000",
           ""
@@ -78,6 +94,14 @@
         [
           "silk_edge_clearance|158500000|51000000|34af1e9d-1f83-49e0-a5f0-61ff662b0fcc|93f133fd-9c77-4853-a971-af688b80af6a",
           ""
+        ],
+        [
+          "silk_edge_clearance|87000000|101112500|00000000-0000-0000-0000-0000613f45bd|c0859927-58a3-4320-b950-a51bf7d447f7",
+          ""
+        ],
+        [
+          "silk_edge_clearance|87000000|84872500|00000000-0000-0000-0000-0000613f45bd|e26550e5-34b4-4304-810d-288a3aefc5de",
+          ""
         ]
       ],
       "meta": {