fix(coding-agent): support configurable npm wrapper command closes #2072

packages/coding-agent/docs/settings.md

@@ -117,6 +117,15 @@ When a provider requests a retry delay longer than `maxDelayMs` (e.g., Google's
 |---------|------|---------|-------------|
 | `shellPath` | string | - | Custom shell path (e.g., for Cygwin on Windows) |
 | `shellCommandPrefix` | string | - | Prefix for every bash command (e.g., `"shopt -s expand_aliases"`) |
+| `npmCommand` | string[] | - | Command argv used for npm package lookup/install operations (e.g., `["mise", "exec", "node@20", "--", "npm"]`) |
+
+```json
+{
+  "npmCommand": ["mise", "exec", "node@20", "--", "npm"]
+}
+```
+
+`npmCommand` is used for all npm package-manager operations, including `npm root -g`, installs, uninstalls, and `npm install` inside git packages. Use argv-style entries exactly as the process should be launched.
 
 ### Model Cycling