ci: disable native strip-types on Node 22+ for ts-node compat

Node 22.18+ enables type stripping by default, preempting ts-node
and causing __dirname to be undefined when detect-module reparses
test files as ESM. Disable native strip-types so ts-node handles
.ts files until mocha is replaced with node:test.

Assisted-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: bennypowers

.github/workflows/verify-node.yml

@@ -56,6 +56,8 @@ jobs:
 
       - name: Test
         run: npm run test:node
+        env:
+          NODE_OPTIONS: ${{ (matrix.node-version != '18' && matrix.node-version != '20') && '--no-experimental-strip-types' || '' }}
 
   verify-windows:
     timeout-minutes: 30