refactor(publish): remove fallback to workflow version

Simplified the socket package.json generation to only use published
versions from the npm registry. If a platform package doesn't exist
in the registry, it's simply skipped rather than using a fallback.

This ensures socket only references actually published binaries and
makes the versioning logic cleaner and more predictable.

Author: jdalton

.github/workflows/publish-socketbin.yml

@@ -462,9 +462,8 @@ jobs:
               pkg.optionalDependencies[pkgName] = version;
               console.log(\`Using published version for \${pkgName}: \${version}\`);
             } catch (e) {
-              // If package doesn't exist yet, use current workflow version
-              pkg.optionalDependencies[pkgName] = '${{ steps.version.outputs.version }}';
-              console.log(\`Package \${pkgName} not found in registry, using: ${{ steps.version.outputs.version }}\`);
+              // Package doesn't exist yet - skip it
+              console.log(\`Package \${pkgName} not found in registry, skipping\`);
             }
           }