Summary

• Rename template marker files to Windows-compatible names.
• Keep support for the previous marker names when reading external templates.
• Update Mocha so the test runner works with the current Node latest version.

Root cause

Windows runners could not check out template files whose names contained angle brackets. The Node latest job also resolved to Node 26, where Mocha 10's yargs dependency failed during ESM loading.

Validation

• pnpm run build
• pnpm run test
• npx -y node@26.2.0 ./node_modules/mocha/bin/mocha.js --forbid-only "test/**/*.test.ts"
• git diff --check