b3c9014379
Resolves InboundAPI-026/027/028/029 (+ newly-surfaced -030). - 026: authorize the scoped Database helper in the design doc; SQL-injection protection is parameter binding (values never concatenated); allow writes via ExecuteAsync; drop the false 'read-only' claim. Named connections only. - 027: async ADO.NET end-to-end (no .GetAwaiter().GetResult()); honour the method deadline token on ExecuteScalarAsync/ExecuteReaderAsync/ExecuteNonQueryAsync + a CommandTimeout backstop derived from the method timeout. - 028: negative-path tests (null-gateway, deadline cancellation, parameterization) + e2e Database + WaitForAttribute cases through the real endpoint. - 029: WaitForAttribute is bounded by its WAIT timeout (per-wait CTS + client-abort + explicit token), NOT the method deadline (spec §6) — a long wait may outlive the method timeout; WithRequestAborted threads the raw client-abort token separately. - 030: Central UI compile-surface mirrors (InboundScriptHost / SandboxInboundScriptHost) gained the Database member (drifted since the runtime helper was added) so the authorized async API type-checks at the design-time gate.