Initial commit - UCXL VS Code extension

- Added UCXL VS Code extension with syntax highlighting
- Implemented language configuration and grammar definitions
- Created extension package with examples and documentation
- Added syntax highlighting for UCXL code structures

🤖 Generated with [Claude Code](https://claude.ai/code)

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

syntaxes/ucxl.tmLanguage.backup.json

@@ -0,0 +1,33 @@
+{
+  "scopeName": "source.ucxl",
+  "patterns": [
+    {
+      "name": "keyword.scheme.ucxl",
+      "match": "\\bucxl://"
+    },
+    {
+      "name": "entity.name.agent.ucxl",
+      "match": "(?<=ucxl://)[a-zA-Z0-9_-]+(?=:)"
+    },
+    {
+      "name": "support.class.topic.ucxl",
+      "match": "(?<=:)[a-zA-Z0-9_-]+(?=@)"
+    },
+    {
+      "name": "entity.name.project.ucxl",
+      "match": "(?<=@)[a-zA-Z0-9_-]+(?=:)"
+    },
+    {
+      "name": "variable.parameter.context.ucxl",
+      "match": "(?<=:)[a-zA-Z0-9_-]+(?=/)"
+    },
+    {
+      "name": "constant.language.temporal.ucxl",
+      "match": "(?<=/)(#|~\\*|\\^\\*|~~|\\^\\^|~\\d+|\\^\\d+)(?=/)"
+    },
+    {
+      "name": "string.path.ucxl",
+      "match": "(?<=/)[^\\s]+"
+    }
+  ]
+}