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- Server-057: extend []-suffix normalization to AddItemBulk/AddBufferedItem so bulk-added array tags bind write-capable handles (authz check, worker bind, and registration kept consistent); update gateway.md + client READMEs. Tests: AddItemBulk/AddBufferedItem wiring. - Server-058: assert []-fallback-resolved bare array names are still denied when out of read/write scope and that MaxWriteClassification is enforced on suffixed array registrations. - Contracts-023/024/025: round-trip + field-19 descriptor pin for MxSparseArray; document MxSparseArray in docs/Contracts.md; enumerate it in the protocol-version-3 test summary. - Tests-040: add wiring tests for the six uncovered sparse-write arms (WriteSecured, Write2, WriteSecured2, Write2Bulk, WriteSecuredBulk, WriteSecured2Bulk). dotnet build + targeted tests green (184 passed).