feat(fls): write the topology of a .fls, loaded by Java as the original

topologyWriter.ts writes konfiguration.xml from Java's view of a project:
the version line, the node items (label position, device with name,
host label flags, interfaces or ports), the cable items and the
documentation items. What a device's constructor makes is changed through
getters, as XMLEncoder does, and more is added; fewer than it makes set the
list anew. Cable ends name the port objects the getters return (the writer
now names a getter's result, <void id="Port0" property="port"/>), and each
cable carries the nodes the editor draws it between.

Checked by Java against Java: every corpus file, read and written again,
loads in Java FILIUS (the oracle's loading method, --sha256 ties its result
to the written bytes) to the same devices, names, positions, interfaces,
cables and documentation as the original; so does a synthetic topology with
what the corpus never sets. The oracle and the reader now also report a
cable's drawing ends (JCablePanel ziel1/ziel2): in the corpus the nodes it
joins, for all 183 cables. Mutation probes rewrite the files and let Java
load each mutant.

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

packages/fls/test/beans/beans.java.json

@@ -296,6 +296,47 @@
     ],
     "errors": []
   },
+  "references.xml": {
+    "values": [
+      {
+        "id": 0,
+        "class": "java.util.LinkedList",
+        "items": [
+          {
+            "id": 1,
+            "class": "filius.hardware.NetzwerkInterface",
+            "properties": {
+              "dns": {
+                "string": ""
+              },
+              "gateway": {
+                "string": ""
+              },
+              "ip": {
+                "string": "10.0.0.1"
+              },
+              "mac": {
+                "string": "8E:A8:7E:96:38:62"
+              },
+              "port": {
+                "id": 2,
+                "class": "filius.hardware.Port",
+                "properties": {}
+              },
+              "subnetzMaske": {
+                "string": "255.255.255.0"
+              },
+              "wireless": false
+            }
+          },
+          {
+            "ref": 2
+          }
+        ]
+      }
+    ],
+    "errors": []
+  },
   "shared.xml": {
     "values": [
       {

packages/fls/test/beans/references.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<java version="17" class="java.beans.XMLDecoder">
+ <object class="java.util.LinkedList">
+  <void method="add">
+   <object class="filius.hardware.NetzwerkInterface">
+    <void property="ip">
+     <string>10.0.0.1</string>
+    </void>
+    <void id="Port0" property="port"/>
+   </object>
+  </void>
+  <void method="add">
+   <object idref="Port0"/>
+  </void>
+ </object>
+</java>