FEA-1546: Disable old Desktop release workflow

- Mark the closedloop-electron Desktop release workflow disabled after release ownership moved to symphony-alpha.

Testing: git diff --check

Risks: Low; the workflow remains present but the release job is skipped before any publishing steps.

Author: shafty023

.github/workflows/release.yml

@@ -1,4 +1,6 @@
-name: Release Desktop
+# Disabled by FEA-1546: Desktop GitHub Releases are now published from
+# closedloop-ai/symphony-alpha after the release-ownership cutover.
+name: Release Desktop (disabled)
 
 on:
   workflow_dispatch:
@@ -12,6 +14,7 @@ env:
 
 jobs:
   release:
+    if: ${{ false }}
     runs-on: macos-latest
     timeout-minutes: 30
     permissions: