fix(ci): Use gh CLI for atomic release creation

Replace softprops/action-gh-release with gh CLI to create releases
and upload assets in a single atomic operation. This prevents issues
with repository rules that make releases immutable immediately,
which was causing asset upload failures.

Previous error:
- Release created successfully but became immutable
- Asset upload failed with "Cannot upload assets to an immutable release"

Solution:
- gh release create uploads all assets in one operation
- Avoids the gap between release creation and asset upload

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

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

.github/workflows/release.yml

@@ -326,17 +326,13 @@ jobs:
           name: release-notes
 
       - name: Create GitHub Release
-        uses: softprops/action-gh-release@v1
-        with:
-          tag_name: ${{ needs.validate.outputs.tag }}
-          name: "BLE-Reticulum ${{ needs.validate.outputs.tag }}"
-          body_path: RELEASE_NOTES.md
-          draft: false
-          prerelease: false
-          files: |
-            release-artifacts/*
         env:
-          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          gh release create "${{ needs.validate.outputs.tag }}" \
+            release-artifacts/* \
+            --title "BLE-Reticulum ${{ needs.validate.outputs.tag }}" \
+            --notes-file RELEASE_NOTES.md
 
       - name: Release summary
         run: |