build: add explanation comment to confirmModulesPurge setting

Author: alan-agius4

pnpm-workspace.yaml

@@ -44,6 +44,10 @@ hoist: false
 # for peer dependencies, avoiding potential mismatches. In addition, it ensures we can continue
 # to rely on peer dependency placeholders substituted via Bazel.
 autoInstallPeers: false
+
+# Avoid prompting for confirmation when pnpm determines node_modules needs to be purged and recreated.
+confirmModulesPurge: false
+
 allowBuilds:
   '@firebase/util': false
   '@google/genai': false
@@ -56,3 +60,4 @@ allowBuilds:
   puppeteer: false
   utf-8-validate: false
   webdriver-manager: true
+