feat: implement OpenFeature provider InitializeAsync

[jonathannorris]

Implements InitializeAsync on DevCycleProvider so Api.Instance.SetProviderAsync(...) waits for DevCycleLocalClient to finish downloading its initial config. Without this, early flag evaluations after SetProviderAsync return defaults instead of targeted values. Other DevCycle SDKs already do this (Node awaits onClientInitialized(), Java/Python poll with a 2s timeout).

DevCycleBaseClient gets a virtual Task InitializeAsync(CancellationToken) returning Task.CompletedTask by default (Cloud is a no-op). DevCycleLocalClient overrides it to await the init task that was previously fired-and-forgotten in the constructor. The cancellation path uses WhenAny + TaskCompletionSource to stay compatible with netstandard2.0, where Task.WaitAsync(CancellationToken) isn't available.

[Copilot]

Pull request overview

This PR updates the SDK’s OpenFeature integration so Api.Instance.SetProviderAsync(...) can await the DevCycle Local client’s initial configuration download, preventing early evaluations from returning defaults. It also bumps OpenFeature to 2.13.0 and aligns dependent packages/framework targets to satisfy the newer dependency requirements.

Changes:

• Implement OpenFeature provider InitializeAsync and add a DevCycleBaseClient.InitializeAsync(...) hook; DevCycleLocalClient now awaits the initial config download task.
• Upgrade OpenFeature to 2.13.0 and bump related dependencies (Microsoft.Extensions.Logging.*, System.Text.Json) to 10.0.0.
• Move benchmark/test projects to net10.0 and add a regression test ensuring SetProviderAsync waits for initialization.

Reviewed changes

Copilot reviewed 12 out of 12 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
DevCycle.SDK.Server.Local/DevCycle.SDK.Server.Local.csproj	Dependency bumps; adds InternalsVisibleTo entry.
DevCycle.SDK.Server.Local/Api/DevCycleLocalClient.cs	Tracks and awaits initial config download via InitializeAsync.
DevCycle.SDK.Server.Local.MSTests/DevCycleTest.cs	Adds regression test for OpenFeature initialization waiting behavior.
DevCycle.SDK.Server.Local.MSTests/DevCycle.SDK.Server.Local.MSTests.csproj	Targets net10.0 and bumps System.Text.Json to 10.0.0.
DevCycle.SDK.Server.Local.Example/DevCycle.SDK.Server.Local.Example.csproj	Bumps System.Text.Json to 10.0.0.
DevCycle.SDK.Server.Local.Benchmark/DevCycle.SDK.Server.Local.Benchmark.csproj	Targets net10.0 and bumps System.Text.Json to 10.0.0.
DevCycle.SDK.Server.Common/DevCycle.SDK.Server.Common.csproj	Bumps OpenFeature to 2.13.0 and updates logging/json dependencies to 10.0.0.
DevCycle.SDK.Server.Common/API/DevCycleProvider.cs	Implements InitializeAsync to delegate to client initialization.
DevCycle.SDK.Server.Common/API/DevCycleBaseClient.cs	Adds virtual InitializeAsync(...) no-op by default.
DevCycle.SDK.Server.Cloud/DevCycle.SDK.Server.Cloud.csproj	Bumps System.Text.Json to 10.0.0.
DevCycle.SDK.Server.Cloud.MSTests/DevCycle.SDK.Server.Cloud.MSTests.csproj	Targets net10.0 and bumps System.Text.Json to 10.0.0.
DevCycle.SDK.Server.Cloud.Example/DevCycle.SDK.Server.Cloud.Example.csproj	Bumps System.Text.Json to 10.0.0.

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[Copilot]

Pull request overview

Copilot reviewed 12 out of 12 changed files in this pull request and generated 3 comments.

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Pull request overview

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[jonathannorris]

@JamieSinn I closed some of these other PRs, But I think this and #202 still make sense.

[Copilot]

Pull request overview

Copilot reviewed 4 out of 4 changed files in this pull request and generated no new comments.

Suppressed comments (2)

DevCycle.SDK.Server.Local.MSTests/DevCycleTest.cs:636

• This test doesn't actually verify the new "wait for init" behavior: DevCycleTestClient.getTestClient() pre-populates the config (localBucketing.StoreConfig(...)) and sets configManager.Initialized = true, so flag evaluation will succeed even if SetProviderAsync doesn't wait. To make this regression-proof, the test needs a client whose Initialized starts as false and whose config fetch is delayed until InitializeAsync runs (likely by extending the test helper / mock HTTP setup).

        [TestMethod]
        public async Task TestOpenFeatureProviderWaitsForClientInit()
        {
            using var dvcClient = DevCycleTestClient.getTestClient();
            await OpenFeature.Api.Instance.SetProviderAsync(dvcClient.GetOpenFeatureProvider());
            var ctx = EvaluationContext.Builder().Set("user_id", "j_test").Build();
            var result = await OpenFeature.Api.Instance.GetClient().GetBooleanValueAsync("test", false, ctx);
            Assert.IsTrue(result);
        }

DevCycle.SDK.Server.Local/Api/DevCycleLocalClient.cs:283

• The cancellation-wait logic is more complex than necessary. Since Task.WaitAsync isn't available on netstandard2.0, you can still implement cancellable waiting with Task.Delay(Timeout.Infinite, cancellationToken) (available on netstandard2.0) and Task.WhenAny, avoiding a custom TaskCompletionSource + token registration.

        public override async Task InitializeAsync(CancellationToken cancellationToken = default)
        {
            if (cancellationToken.CanBeCanceled)
            {
                var tcs = new TaskCompletionSource<bool>(TaskCreationOptions.RunContinuationsAsynchronously);
                using (cancellationToken.Register(() => tcs.TrySetResult(true)))
                {
                    var completed = await Task.WhenAny(initializeTask, tcs.Task).ConfigureAwait(false);
                    if (completed != initializeTask)
                    {
                        cancellationToken.ThrowIfCancellationRequested();
                    }
                }
            }
            await initializeTask.ConfigureAwait(false);
        }