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.json

@@ -0,0 +1,36 @@
+{
+  "scopeName": "source.ucxl",
+  "name": "UCXL",
+  "patterns": [
+    {
+      "name": "meta.ucxl",
+      "match": "^ucxl://([A-Z0-9]{5})" ,
+      "captures": {
+        "1": { "name": "constant.language.agent.ucxl" }
+      }
+    },
+    {
+      "match": "^ucxl://[A-Z0-9]{5}:([a-zA-Z0-9_-]+)",
+      "captures": {
+        "1": { "name": "entity.name.role.ucxl" }
+      }
+    },
+    {
+      "match": "@([a-zA-Z0-9_-]+):([a-zA-Z0-9_-]+)",
+      "captures": {
+        "1": { "name": "entity.name.project.ucxl" },
+        "2": { "name": "entity.name.task.ucxl" }
+      }
+    },
+    {
+      "match": "\\/(#|~\\*|\\^\\*|~~|\\^\\^|~\\d+|\\^\\d+)\\/",
+      "captures": {
+        "1": { "name": "constant.language.temporal.ucxl" }
+      }
+    },
+    {
+      "match": "\\/([^\\s]+)$",
+      "name": "string.path.ucxl"
+    }
+  ]
+}