Remove 'Loop variable inference' pattern (redundant with type-inference-with-var)

- Delete content/language/enhanced-for-with-var.json
- Fix prev/next chain: flexible-constructor-bodies ↔ diamond-operator
- Update related references in 3 patterns to point to type-inference-with-var
- 89 → 88 snippets

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: brunoborges

content/language/diamond-operator.json

@@ -34,7 +34,7 @@
     "state": "available",
     "description": "Diamond with anonymous classes since JDK 9 (Sept 2017)."
   },
-  "prev": "language/enhanced-for-with-var",
+  "prev": "language/flexible-constructor-bodies",
   "next": "language/private-interface-methods",
   "related": [
     "language/type-inference-with-var",

content/language/enhanced-for-with-var.json

@@ -39,6 +39,6 @@
   "related": [
     "language/sealed-classes",
     "language/pattern-matching-instanceof",
-    "language/enhanced-for-with-var"
+    "language/type-inference-with-var"
   ]
 }

content/language/exhaustive-switch.json

@@ -35,7 +35,7 @@
     "description": "Finalized in JDK 25 LTS (JEP 513, Sept 2025)."
   },
   "prev": "language/compact-source-files",
-  "next": "language/enhanced-for-with-var",
+  "next": "language/diamond-operator",
   "related": [
     "language/type-inference-with-var",
     "language/text-blocks-for-multiline-strings",

content/language/flexible-constructor-bodies.json

@@ -38,7 +38,7 @@
   "next": "language/records-for-data-classes",
   "related": [
     "language/compact-source-files",
-    "language/enhanced-for-with-var",
+    "language/type-inference-with-var",
     "language/text-blocks-for-multiline-strings"
   ]
 }

content/language/pattern-matching-instanceof.json

@@ -39,6 +39,6 @@
   "related": [
     "language/compact-source-files",
     "language/flexible-constructor-bodies",
-    "language/enhanced-for-with-var"
+    "language/type-inference-with-var"
   ]
 }