Merge R2-02 ResilienceConfig hardening (arch-review round 2) [PR #431]

Findings 01/S-6 (High — clamp hostile ResilienceConfig, no ValidationException
driver-brick), 01/U-6 (delete dead bulkhead knob), 01/S-8=03/S12 (Write/Ack
non-idempotent + retry->0), 04/C-7 (JsonObject round-trip preserves unknown
keys), 01/S-7=03/S13 (per-Create options-generation kills respawn cache race).
T15/T18 deferred. STATUS.md conflict resolved additively. Build clean.

tests/Server/ZB.MOM.WW.OtOpcUa.AdminUI.Tests/ResilienceFormModelTests.cs

@@ -1,3 +1,4 @@
+using System.Text.Json.Nodes;
 using Shouldly;
 using Xunit;
 using ZB.MOM.WW.OtOpcUa.AdminUI.Components.Shared.Drivers;
@@ -6,6 +7,59 @@ using ZB.MOM.WW.OtOpcUa.Core.Resilience;
 
 public class ResilienceFormModelTests
 {
+    // ---- 04/C-7: non-lossy round-trip ----
+
+    [Fact]
+    public void Unknown_top_level_key_survives_round_trip()
+    {
+        // bulkheadMaxConcurrent doubles as the 01/U-6 continuity proof: the deleted knob's key survives.
+        var json = """{"bulkheadMaxConcurrent":16,"capabilityPolicies":{"Read":{"timeoutSeconds":5}}}""";
+
+        var back = ResilienceFormModel.FromJson(json).ToJson();
+
+        back.ShouldNotBeNull();
+        var obj = JsonNode.Parse(back)!.AsObject();
+        obj["bulkheadMaxConcurrent"]!.GetValue<int>().ShouldBe(16);
+        obj["capabilityPolicies"]!["Read"]!["timeoutSeconds"]!.GetValue<int>().ShouldBe(5);
+    }
+
+    [Fact]
+    public void Unknown_capability_entry_survives_round_trip()
+    {
+        var json = """{"capabilityPolicies":{"Read":{"timeoutSeconds":5},"FutureCap":{"timeoutSeconds":9}}}""";
+
+        var back = ResilienceFormModel.FromJson(json).ToJson();
+
+        back.ShouldNotBeNull();
+        var obj = JsonNode.Parse(back)!.AsObject();
+        obj["capabilityPolicies"]!["FutureCap"]!["timeoutSeconds"]!.GetValue<int>().ShouldBe(9);
+        obj["capabilityPolicies"]!["Read"]!["timeoutSeconds"]!.GetValue<int>().ShouldBe(5);
+    }
+
+    [Fact]
+    public void Unknown_per_policy_field_survives_round_trip()
+    {
+        var json = """{"capabilityPolicies":{"Read":{"timeoutSeconds":5,"futureField":7}}}""";
+
+        var back = ResilienceFormModel.FromJson(json).ToJson();
+
+        back.ShouldNotBeNull();
+        var read = JsonNode.Parse(back)!.AsObject()["capabilityPolicies"]!["Read"]!.AsObject();
+        read["timeoutSeconds"]!.GetValue<int>().ShouldBe(5);
+        read["futureField"]!.GetValue<int>().ShouldBe(7);
+    }
+
+    [Fact]
+    public void Malformed_json_sets_ParseFailed_and_ToJson_returns_original_text()
+    {
+        const string json = "{ not json";
+
+        var m = ResilienceFormModel.FromJson(json);
+
+        m.ParseFailed.ShouldBeTrue();
+        m.ToJson().ShouldBe(json);   // never overwrite what it couldn't read
+    }
+
     [Fact]
     public void Blank_form_serializes_to_null()
         => new ResilienceFormModel().ToJson().ShouldBeNull();
@@ -13,7 +67,7 @@ public class ResilienceFormModelTests
     [Fact]
     public void Partial_override_round_trips()
     {
-        var m = new ResilienceFormModel { BulkheadMaxConcurrent = 16 };
+        var m = new ResilienceFormModel { RecycleIntervalSeconds = 3600 };
         m.Policies["Read"].TimeoutSeconds = 5;
         m.Policies["Read"].RetryCount = 5;
 
@@ -21,7 +75,7 @@ public class ResilienceFormModelTests
         json.ShouldNotBeNull();
 
         var back = ResilienceFormModel.FromJson(json);
-        back.BulkheadMaxConcurrent.ShouldBe(16);
+        back.RecycleIntervalSeconds.ShouldBe(3600);
         back.Policies["Read"].TimeoutSeconds.ShouldBe(5);
         back.Policies["Write"].IsEmpty.ShouldBeTrue();
     }
@@ -30,19 +84,48 @@ public class ResilienceFormModelTests
     public void Malformed_json_yields_empty_model()
     {
         var m = ResilienceFormModel.FromJson("{ not valid json");
-        m.BulkheadMaxConcurrent.ShouldBeNull();
+        m.RecycleIntervalSeconds.ShouldBeNull();
         m.Policies["Read"].IsEmpty.ShouldBeTrue();
     }
 
+    [Fact]
+    public void Validate_flags_out_of_range_values_with_capability_and_range()
+    {
+        var m = new ResilienceFormModel();
+        m.Policies["Read"].TimeoutSeconds = 0;      // < MinTimeoutSeconds
+        m.Policies["Read"].RetryCount = -1;         // < MinRetryCount
+        m.Policies["Read"].BreakerFailureThreshold = 1;  // below Polly MinimumThroughput floor
+
+        var msgs = m.Validate();
+
+        msgs.Count.ShouldBe(3);
+        msgs.ShouldContain(s => s.Contains("Read") && s.Contains("timeout"));
+        msgs.ShouldContain(s => s.Contains("Read") && s.Contains("retries"));
+        msgs.ShouldContain(s => s.Contains("Read") && s.Contains("breaker"));
+    }
+
+    [Fact]
+    public void Validate_passes_in_range_and_blank()
+    {
+        var blank = new ResilienceFormModel();
+        blank.Validate().ShouldBeEmpty();
+
+        var inRange = new ResilienceFormModel();
+        inRange.Policies["Read"].TimeoutSeconds = 5;
+        inRange.Policies["Read"].RetryCount = 3;
+        inRange.Policies["Read"].BreakerFailureThreshold = 4;
+        inRange.Policies["Write"].BreakerFailureThreshold = 0;   // 0 = breaker off, legal
+        inRange.Validate().ShouldBeEmpty();
+    }
+
     [Fact]
     public void Emitted_json_is_consumable_by_the_runtime_parser()
     {
-        var m = new ResilienceFormModel { BulkheadMaxConcurrent = 16 };
+        var m = new ResilienceFormModel();
         m.Policies["Read"].TimeoutSeconds = 7;
 
         var opts = DriverResilienceOptionsParser.ParseOrDefaults(DriverTier.B, m.ToJson(), out var diag);
         diag.ShouldBeNull();
-        opts.BulkheadMaxConcurrent.ShouldBe(16);
         opts.Resolve(DriverCapability.Read).TimeoutSeconds.ShouldBe(7);
         opts.Resolve(DriverCapability.Write).RetryCount.ShouldBe(0);
     }