chore: add trustPolicy to npmrc for security

Add trustPolicy=no-downgrade to prevent package downgrade attacks.

Author: jdalton

.npmrc

@@ -4,4 +4,7 @@ ignore-scripts=true
 # Suppress pnpm workspace warnings
 link-workspace-packages=false
 loglevel=error
-prefer-workspace-packages=false
+prefer-workspace-packages=false
+
+# Trust policy - prevent downgrade attacks
+trustPolicy=no-downgrade