feat(fls): XMLEncoder reader following java.beans.XMLDecoder

A generic interpreter for the .fls configuration: objects, properties,
calls, indexes, static fields and factories, Field.set, and id/idref
anywhere — including getter results, answered from the measured Java
defaults or reported as unresolved. All 23 corpus files: class and
position of every node as Java reads them, also where Swift loses nodes.

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

packages/fls/tsconfig.json

@@ -3,7 +3,11 @@
   "compilerOptions": {
     "rootDir": "src",
     "outDir": "dist",
-    "types": []
+    "types": [],
+    "resolveJsonModule": true
   },
-  "include": ["src"]
+  "include": [
+    "src",
+    "src/*.json"
+  ]
 }