chore: bump extension to v1.5.2, publish with icon

Author: manojmallick

vscode-extension/package.json

@@ -2,7 +2,7 @@
   "name": "sigmap",
   "displayName": "SigMap",
   "description": "Zero-dependency AI context engine — keeps copilot-instructions.md fresh automatically.",
-  "version": "1.5.0",
+  "version": "1.5.2",
   "publisher": "manojmallick",
   "engines": {
     "vscode": "^1.85.0"