Add test_routes.sh to verify all SPA routes on ai-code-battle.pages.dev
return valid HTML. All 36 static/redirect/parameterized routes pass.
The /r2/ data paths return 404 (data not yet deployed to R2).
Test method: curl (ADB not available on this system). For full
device testing, see related bead bf-cmh1.
Closes: bf-2qp0
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
