Document rscBundle parameter's Sub-PR 3 role

The parameter is unused until Sub-PR 3 wires rscWebpackConfig.js to
call configureServer(true). Adding a short comment so it isn't
mistaken for dead code during review.

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: ihabadham

config/webpack/serverWebpackConfig.js

@@ -16,6 +16,10 @@ function extractLoader(rule, loaderName) {
   });
 }
 
+// rscBundle: set to true in Sub-PR 3 for the RSC client-reference bundle,
+// which handles RSCWebpackPlugin(isServer: false) separately. Default
+// false builds the SSR bundle with RSCWebpackPlugin(isServer: true).
+// Follows the Pro dummy's `serverWebpackConfig(rscBundle)` pattern.
 const configureServer = (rscBundle = false) => {
   const bundler = getBundler();