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Chris
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## Related Issues Follow-up to #8233. ## Summary of Changes Registration runtime fixtures timed out in the workspace CI lane while the same cases passed in the feature lanes. Reserve nextest capacity for the exact `connect_registration` binary, as already done for related inventory and drive fixtures. Keep its existing deadlines, internal concurrency, assertions and zero-retry policy; report the last watch status on failure. Rolling upgrades could pass `ListBuckets` readiness while restarted peers still lacked write quorum. Before each mixed-version phase, probe writes through every node outside the asserted workload prefixes. A shared 30-second deadline includes requests and sleeps; only HTTP 503 with `ServiceUnavailable` is retryable, with SDK retries disabled for these probes. The actual compatibility writes, reads, multipart operations and listing assertions remain unchanged. Add four fast regression tests to the existing PR smoke profile, with matching exclusion from the full profile. No new workflow or job is introduced. ## Verification - `cargo nextest run --locked --profile ci -p rustfs --lib --test connect_registration --test-threads 4 -E 'binary(/^connect_registration$/) | test(=connect::diagnostics::trace_runtime::tests::local_runtime_rejects_non_private_state)' --no-tests fail --status-level pass --final-status-level fail` passed 23/23 twice in 5.088s and 5.097s: 22 macOS registration tests plus one unrelated control. JUnit intervals confirm capacity reservation; no retries or test-process leaks occurred. The Linux-only inventory case remains for CI. - `cargo nextest run -p e2e_test --lib --profile ci -E 'test(upgrade_write_readiness_tests)' --no-fail-fast --no-tests fail` passed 4/4 twice in 1.068s and 1.072s, with zero retries. Regressions cover metadata readiness followed by write unavailability, recovery through every writer, immediate permanent-error failure despite an incoming SDK retry configuration, and deadlines for repeated 503s and stalled requests. The original failure is recorded in [the mixed-version upgrade job](https://github.com/rustfs/rustfs/actions/runs/36569700716/job/109415806473). - `cargo fmt --all --check`, `git diff --check`, `python3 scripts/check_test_wiring.py` and compiled smoke/full membership checks passed. Smoke membership changes from 188 to 192 by adding exactly these four tests; full membership is unchanged. The expected Linux smoke digest was derived from the actual prior Linux listing plus those four platform-independent additions and still requires confirmation by this PR's CI. Local verification covers the exact source committed in `9b2ea836317ed035a91d1fc9fcf725f70c3098e2` on main `380e98a42cb4fcd0994fed79b30c2c7605deb0bc`. An independent final-diff correctness and reliability review found no findings. Fresh Linux workspace and real mixed-version upgrade runs are required before treating the remediation as fully verified; local fake-target tests do not establish that result. ## Impact Test scheduling and readiness only; no production behavior, API, dependency, test deadline or compatibility assertion changes. Reserving capacity serializes registration fixture processes within a nextest run. The bounded readiness probes may add startup time while peer write health converges; permanent errors still fail immediately. ## Additional Notes Rollback by reverting this PR. Existing CI restructuring from #8233 is independent of these follow-up fixes.