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The tag_variations and live_sync suites waited for cross-relay discovery with a fixed one-second sleep before publishing events, and verified sync with five-second polls. On a loaded runner discovery can take longer than the sleep, and events published before the syncing relay subscribes are only recovered by later passes that miss the short verification window. CI hit this on this PR's first run (tag_variations uppercase-A), and different members of the same family fail locally on different runs under load. Discovery waits now use the existing wait_for_sync_connection helper (bounded poll of the syncing relay's metrics endpoint) instead of a sleep, the ordering test polls for each event instead of sleeping three seconds, and verification deadlines widen to 30 seconds. Bounded polls return as soon as the condition holds, so healthy runs are no slower; only the failure bound moves. Validated by running the sync suite repeatedly under a hostile git config on a heavily loaded machine: the previously flaky tests pass in every run. req_concurrency also flakes under such load at its phase-1 quiescence wait, but restructuring it needs an observable for descendant-sweep completion that the relay does not yet expose, so it is deliberately left unchanged (it has not flaked in CI). Formatting fixes carried earlier in this branch were dropped: master picked up equivalent rewraps via the relay-identity merge and is fmt-clean again.