Add 30-second timeouts to concurrency tests

- AsyncVisitorConcurrencyTests
- AsyncVisitorResultConcurrencyTests
- VisitorConcurrencyTests
- VisitorResultConcurrencyTests
- AsyncTemplateMethodTests (concurrency scenario)
- BridgeTests (concurrency scenario)

These tests could hang on deadlocks; timeouts ensure they fail fast
rather than blocking CI indefinitely.

Author: JerrettDavis

test/PatternKit.Tests/Behavioral/AsyncTemplateMethodTests.cs

@@ -58,7 +58,7 @@ public Task ExecuteAsync_RunsHooks_And_Returns()
            .AssertPassed();
 
     [Scenario("Not synchronized allows concurrency")]
-    [Fact]
+    [Fact(Timeout = 30_000)]
     public Task Allows_Concurrency_When_Not_Synchronized()
         => Given("a non-synchronized template with delay", () => new SampleAsyncTemplate(delayMs: 25, sync: false))
            .When("ExecuteAsync on 1..4 in parallel", t =>

test/PatternKit.Tests/Behavioral/AsyncVisitorConcurrencyTests.cs

@@ -16,7 +16,7 @@ private sealed record Add(Node Left, Node Right) : Node;
     private sealed record Neg(Node Inner) : Node;
 
     [Scenario("AsyncActionVisitor executes correctly under concurrent calls across tasks")]
-    [Fact]
+    [Fact(Timeout = 30_000)]
     public Task AsyncActionVisitor_Concurrent_Dispatch()
         => Given("an async action visitor and a mixed dataset", () =>
             {

test/PatternKit.Tests/Behavioral/AsyncVisitorResultConcurrencyTests.cs

@@ -16,7 +16,7 @@ private sealed record Add(Node Left, Node Right) : Node;
     private sealed record Neg(Node Inner) : Node;
 
     [Scenario("Async Result Visitor returns correct codes under concurrent tasks")]
-    [Fact]
+    [Fact(Timeout = 30_000)]
     public Task AsyncResultVisitor_Concurrent_Dispatch()
         => Given("an async result visitor and a mixed dataset", () =>
             {

test/PatternKit.Tests/Behavioral/VisitorConcurrencyTests.cs

@@ -16,7 +16,7 @@ private sealed record Add(Node Left, Node Right) : Node;
     private sealed record Neg(Node Inner) : Node;
 
     [Scenario("ActionVisitor executes correctly under concurrent calls across threads")]
-    [Fact]
+    [Fact(Timeout = 30_000)]
     public Task ActionVisitor_Concurrent_Dispatch()
         => Given("an action visitor and a mixed dataset", () =>
             {

test/PatternKit.Tests/Behavioral/VisitorResultConcurrencyTests.cs

@@ -16,7 +16,7 @@ private sealed record Add(Node Left, Node Right) : Node;
     private sealed record Neg(Node Inner) : Node;
 
     [Scenario("Result Visitor returns correct codes under parallel calls across threads")]
-    [Fact]
+    [Fact(Timeout = 30_000)]
     public Task ResultVisitor_Concurrent_Dispatch()
         => Given("a result visitor and a mixed dataset", () =>
             {

test/PatternKit.Tests/Structural/Bridge/BridgeTests.cs

@@ -86,7 +86,7 @@ public Task Missing_Operation_Throws()
             .AssertPassed();
 
     [Scenario("Concurrency: many Execute calls increment op count exactly once each")]
-    [Fact]
+    [Fact(Timeout = 30_000)]
     public async Task Concurrency_Execute_Is_Safe()
     {
         var bridge = Bridge<Job, string, Renderer>