feat(options): eager startup validation for edge/management options (InboundAPI, ESG, Notification, ManagementService) (arch-review 08 §1.5)

Claude-Session: https://claude.ai/code/session_01MtdgwpEeCUn6cUA5f1LMPj

src/ZB.MOM.WW.ScadaBridge.ManagementService/ManagementServiceOptionsValidator.cs

@@ -0,0 +1,30 @@
+using ZB.MOM.WW.Configuration;
+
+namespace ZB.MOM.WW.ScadaBridge.ManagementService;
+
+/// <summary>
+/// Validates <see cref="ManagementServiceOptions"/> at startup. Both
+/// <see cref="ManagementServiceOptions.CommandTimeout"/> and
+/// <see cref="ManagementServiceOptions.LongRunningCommandTimeout"/> are used as Ask timeouts against
+/// the ManagementActor; a zero/negative value makes every management command fail immediately (or Ask
+/// forever). Registered with <c>ValidateOnStart()</c> so a bad <c>ScadaBridge:ManagementService</c>
+/// section fails fast at boot with a clear, key-naming message.
+/// <para>
+/// <see cref="ManagementServiceOptions.SecuredWritePendingTtl"/> is intentionally NOT required positive:
+/// a non-positive value legitimately disables server-side secured-write expiry.
+/// </para>
+/// </summary>
+public sealed class ManagementServiceOptionsValidator : OptionsValidatorBase<ManagementServiceOptions>
+{
+    /// <inheritdoc />
+    protected override void Validate(ValidationBuilder builder, ManagementServiceOptions options)
+    {
+        builder.RequireThat(options.CommandTimeout > TimeSpan.Zero,
+            $"ScadaBridge:ManagementService:CommandTimeout must be a positive duration " +
+            $"(was {options.CommandTimeout}); it is the Ask timeout for management commands.");
+
+        builder.RequireThat(options.LongRunningCommandTimeout > TimeSpan.Zero,
+            $"ScadaBridge:ManagementService:LongRunningCommandTimeout must be a positive duration " +
+            $"(was {options.LongRunningCommandTimeout}); it is the Ask timeout for transport/deploy commands.");
+    }
+}