fix(dx): add node_modules guard to pre-push hook and pin Node 22 (#1368)

Worktrees start with no node_modules, causing tsc to fail with
misleading TS2307 errors. The guard auto-runs npm install on first push.
.nvmrc pins Node 22 to match CI and avoid Node 24 compat issues.

.husky/pre-push

@@ -1,3 +1,9 @@
+# Ensure dependencies are installed (worktrees start with no node_modules)
+if [ ! -d node_modules ]; then
+  echo "node_modules missing, running npm install..."
+  npm install --prefer-offline || exit 1
+fi
+
 echo "Running type check..."
 npm run typecheck || exit 1
 

.nvmrc

@@ -0,0 +1 @@
+22