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The worker-side half of the review tail. Tests and comments only — nothing here changes worker behavior, and none of it compiles on the macOS tree (net48/x86), so it was reviewed line by line against the already-windev-validated files. - MxAccessHandleRegistryTests gains the multi-candidate case behind MxAccessSession.TryGetCachedReadFor's fall-through: one tag under two item handles, the lower registered-but-unadvised and the higher advised. Asserted at the registry rather than the session because the session's read path needs a live MXAccess COM instance; what the registry owes the scan is the stable ascending candidate order and a per-item-handle (not per-tag) advice index, and both are pinned here along with the fall-through contract in prose. - A single adversarial lifecycle test — register, advise, re-register the same item handle under a new tag, unadvise, unregister the server — asserting every index agrees after each step. The individual transitions were already covered; what was not was that they compose, and a stale entry in any one index resurrects a handle MXAccess has already retired. - StaWaitHelperTests.WaitForSignalOrMessages_PreSignalledHandle_ReturnsImmediately drains pending messages first, like the other two wait tests. Without it a stale message can end the wait instead of the handle, failing the signal-consumed post-condition for an unrelated reason. - GatewayTesting.md records the two findings from the Task 24 windev gate: SecretsStorePathGuardTests.CreateBuilder_AcceptsSecretsStoreOutsideContentRoot_AndCreatesIt fails deterministically on Windows on main too (SQLite pooling holds secrets.db open across the cleanup's recursive delete; pre-existing, tracked separately), and the StaWaitHelper timing tests' flake signature on a loaded box is a message wake — the helper working as designed — not a broken wait.