docs(node): document pre-bundled items and how to opt out

Author: V-Subhankar-infy

src/node/NOTES.md

@@ -1,3 +1,27 @@
+## Pre-bundled items
+
+> [!NOTE]
+> Beyond the core install, this feature also sets up a few items by default for convenience — recommended VS Code extensions (such as a linter) and supporting tools. This is intentional behavior shared across features in this repository.
+
+## Excluding pre-bundled items
+
+Exclude a bundled **VS Code extension** by prefixing its ID with `-`, or disable a bundled **tool** by setting its option to `none` :
+
+```json
+{
+    "features": {
+        "ghcr.io/devcontainers/features/node:2": {
+            "pnpmVersion": "none"
+        }
+    },
+    "customizations": {
+        "vscode": {
+            "extensions": [ "-dbaeumer.vscode-eslint" ]
+        }
+    }
+}
+```
+
 ## Using nvm from postCreateCommand or another lifecycle command
 
 Certain operations like `postCreateCommand` run non-interactive, non-login shells. Unfortunately, `nvm` is really particular that it needs to be "sourced" before it is used, which can only happen automatically with interactive and/or login shells. Fortunately, this is easy to work around: