VS Code: decoration-based matching, Ctrl+K bindings, README overhaul (from dev f84517152b7f)

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

doc/edit/vscode/language-configuration.json

@@ -1,11 +1,18 @@
 {
     "comments": {
         "lineComment": "#",
-        "blockComment": ["#[", "]#"]
+        "blockComment": [
+            "#[",
+            "]#"
+        ]
     },
     "brackets": [
-        ["#[", "]#"]
+        [
+            "#[",
+            "]#"
+        ]
     ],
     "autoClosingPairs": [],
-    "surroundingPairs": []
+    "surroundingPairs": [],
+    "wordPattern": "@{1,3}[A-Za-z0-9_]+|[A-Za-z0-9_]+@{1,3}|@{1,3}|[A-Za-z0-9_]+"
 }