Enable startup CPU boost on Cloud Run candidate deploys

Cold-start imports (~232s, dominated by country package construction)
sit on the edge of Cloud Run's hard 240s startup probe cap, which
cannot be extended by any probe configuration. Startup CPU boost
shortens the import within that cap; the structural fix (binding the
port before app import) follows in the next migration stage.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

Author: anth-volk

.github/scripts/deploy_cloud_run_candidate.sh

@@ -47,6 +47,7 @@ cloud_run_run gcloud run deploy "${CLOUD_RUN_SERVICE}" \
   --add-cloudsql-instances "${CLOUD_RUN_CLOUD_SQL_INSTANCE}" \
   --port "${CLOUD_RUN_PORT}" \
   --cpu "${CLOUD_RUN_CPU}" \
+  --cpu-boost \
   --memory "${CLOUD_RUN_MEMORY}" \
   --timeout "${CLOUD_RUN_TIMEOUT}" \
   --min-instances "${CLOUD_RUN_MIN_INSTANCES}" \