fix(vscode-active-agents): use SCM Providers category (#415)

Marketplace rejected 'Source Control' with:
"The category 'Source Control' is not available in language 'en-us'."

The official VS Code category name is 'SCM Providers'; switch both the
live manifest and the template copy to match.

Co-authored-by: NagyVikt <nagy.viktordp@gmail.com>
Co-authored-by: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: 3 people

templates/vscode/guardex-active-agents/package.json

@@ -10,7 +10,7 @@
     "vscode": "^1.88.0"
   },
   "categories": [
-    "Source Control",
+    "SCM Providers",
     "Other"
   ],
   "activationEvents": [

vscode/guardex-active-agents/package.json

@@ -10,7 +10,7 @@
     "vscode": "^1.88.0"
   },
   "categories": [
-    "Source Control",
+    "SCM Providers",
     "Other"
   ],
   "activationEvents": [