ci(vscode): make Marketplace and Open VSX publishes idempotent

Skip each publish when the version is already live, so workflow_dispatch
can re-run safely — needed to bootstrap the first Open VSX publish of an
already-Marketplace-released version.

Author: Laurent Guitton

.github/workflows/publish-vscode.yml

@@ -89,6 +89,11 @@ jobs:
             echo "::error::VSCE_PAT secret is not set — cannot publish."
             exit 1
           fi
+          VER=$(node -p "require('./package.json').version")
+          if pnpm exec vsce show gitwand.gitwand-vscode --json 2>/dev/null | grep -q "\"version\": \"${VER}\""; then
+            echo "::notice::gitwand-vscode ${VER} already on the Marketplace, skipping"
+            exit 0
+          fi
           # Publish the exact .vsix built in the Package step (core is already
           # bundled in, so the package is self-contained).
           pnpm exec vsce publish --packagePath gitwand-vscode-*.vsix
@@ -103,5 +108,10 @@ jobs:
             echo "::warning::OVSX_PAT secret is not set — skipping Open VSX publish."
             exit 0
           fi
+          VER=$(node -p "require('./package.json').version")
+          if curl -fsS "https://open-vsx.org/api/gitwand/gitwand-vscode/${VER}" >/dev/null 2>&1; then
+            echo "::notice::gitwand-vscode ${VER} already on Open VSX, skipping"
+            exit 0
+          fi
           # Same self-contained .vsix as the Marketplace publish above.
           pnpm exec ovsx publish --packagePath gitwand-vscode-*.vsix --pat "$OVSX_PAT"