test: stabilize relay ops hello timeout

[freshtechbro]

Summary

• arm the ops error and close listeners before the shortened relay hello timeout can fire
• preserves the explicit ops timeout error, 1011 close assertion, and readiness cleanup assertions

Testing

• npm run test -- tests/relay-server.test.ts -t "fails silent ops hello handshakes explicitly and clears relay readiness"
• npm run test -- tests/relay-server.test.ts
• npm run lint
• npm run typecheck
• npm run test
• npm run build
• npm run extension:build
• npm run version:check
• node scripts/audit-zombie-files.mjs
• node scripts/docs-drift-check.mjs
• node scripts/chrome-store-compliance-check.mjs
• ./skills/opendevbrowser-best-practices/scripts/validate-skill-assets.sh
• NPM_CONFIG_CACHE=/tmp/odb-npx-cache-help-flag npx opendevbrowser --help
• NPM_CONFIG_CACHE=/tmp/odb-npx-cache-help-command npx opendevbrowser help