feat(core): home router NAT after Java, measured with Java FILIUS

The core translates before the IP thread, as Java's NAT threads sit
between card and Ethernet: out, the WAN address and the entry's port (ICMP
keeps its identifier); in, by remote end, port and protocol, else by the
port forwarding, which then makes a dynamic entry; a ping at the WAN
address is answered by the router, packets from outside for the LAN are
dropped, both sides pass the router's firewall, TTL 1 going out gets time
exceeded. Dynamic entries expire at Java's check each second, 300 s times
the delay factor old (55 minutes at 90 %), refreshed only by what comes in.
The home router forwards as a router does.

Measured and not taken: when a LAN endpoint sends to a second remote end,
Java gives it the entry's WAN port but no entry, and the answer stays at
the router; the core adds an entry for each new remote end on that port.

The oracle now records every card of a node (the second card of routers
was missing); the ARP and RIP runs are recorded anew and still match.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>

packages/core/test/scenarios/arp-java-pingLan.java.json

@@ -2,7 +2,7 @@
   "frames": {
     "00000000-0000-0000-0000-000000000301": [
       {
-        "time": 716,
+        "time": 747,
         "source": "02:00:00:00:03:11",
         "destination": "FF:FF:FF:FF:FF:FF",
         "arp": 1,
@@ -10,7 +10,7 @@
         "targetIp": "10.0.0.9"
       },
       {
-        "time": 3467,
+        "time": 3497,
         "source": "02:00:00:00:03:11",
         "destination": "FF:FF:FF:FF:FF:FF",
         "arp": 1,
@@ -20,7 +20,7 @@
     ],
     "00000000-0000-0000-0000-000000000302": [
       {
-        "time": 837,
+        "time": 869,
         "source": "02:00:00:00:03:11",
         "destination": "FF:FF:FF:FF:FF:FF",
         "arp": 1,
@@ -28,7 +28,7 @@
         "targetIp": "10.0.0.9"
       },
       {
-        "time": 3578,
+        "time": 3609,
         "source": "02:00:00:00:03:11",
         "destination": "FF:FF:FF:FF:FF:FF",
         "arp": 1,
@@ -36,15 +36,16 @@
         "targetIp": "10.0.0.9"
       }
     ],
+    "00000000-0000-0000-0000-000000000302#1": [],
     "00000000-0000-0000-0000-000000000303": []
   },
   "events": [
     [
-      712,
+      743,
       "sendProbe 10.0.0.9 called"
     ],
     [
-      6222,
+      6253,
       "sendProbe 10.0.0.9 returned ICMP 3/1 from 127.0.0.1"
     ]
   ]