feat: port WorkflowStore plugins (Oracle, Mongo, Postgres) from Serdica

Ported 3 database backend plugins with namespace adaptation:
- Oracle: EF Core-based store with AQ signaling wiring (2 files)
- MongoDB: Delegates to DataStore.MongoDB extension method (2 files)
- PostgreSQL: Delegates to DataStore.PostgreSQL extension method (2 files)

Implementation files already exist in __Libraries DataStore projects
(ported in earlier commits). These plugins are thin IDependencyInjectionRoutine
wrappers that enable dynamic plugin loading via the workflow plugin system.

Also fleshed out the stub OracleWorkflowDataStoreExtensions to register
WorkflowDbContext, OracleWorkflowRuntimeStateStore, and
OracleWorkflowHostedJobLockService.

All namespaces converted from Ablera.Serdica to StellaOps.
Plugin interface adapted from IPluginServiceRegistrator to IDependencyInjectionRoutine.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

src/Workflow/StellaOps.Workflow.slnx

@@ -14,6 +14,11 @@
     <Project Path="__Libraries/StellaOps.Workflow.Signaling.Redis/StellaOps.Workflow.Signaling.Redis.csproj" />
   </Folder>
   <Project Path="../__Libraries/StellaOps.ElkSharp/StellaOps.ElkSharp.csproj" />
+  <Folder Name="/__Plugins/">
+    <Project Path="__Plugins/StellaOps.Workflow.Plugin.WorkflowStore.Oracle/StellaOps.Workflow.Plugin.WorkflowStore.Oracle.csproj" />
+    <Project Path="__Plugins/StellaOps.Workflow.Plugin.WorkflowStore.Mongo/StellaOps.Workflow.Plugin.WorkflowStore.Mongo.csproj" />
+    <Project Path="__Plugins/StellaOps.Workflow.Plugin.WorkflowStore.Postgres/StellaOps.Workflow.Plugin.WorkflowStore.Postgres.csproj" />
+  </Folder>
   <Project Path="StellaOps.Workflow.WebService/StellaOps.Workflow.WebService.csproj" />
   <Folder Name="/__Tests/">
     <Project Path="__Tests/StellaOps.Workflow.Engine.Tests/StellaOps.Workflow.Engine.Tests.csproj" />

src/Workflow/__Libraries/StellaOps.Workflow.DataStore.Oracle/OracleWorkflowDataStoreExtensions.cs

@@ -1,5 +1,6 @@
 using Microsoft.Extensions.Configuration;
 using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.DependencyInjection.Extensions;
 using Microsoft.EntityFrameworkCore;
 using StellaOps.Workflow.Abstractions;
 
@@ -10,10 +11,27 @@ public static class OracleWorkflowDataStoreExtensions
     public static IServiceCollection AddWorkflowOracleDataStore(
         this IServiceCollection services, IConfiguration configuration)
     {
-        // Register WorkflowDbContext with Oracle provider
-        // Register OracleWorkflowRuntimeStateStore
-        // Register OracleWorkflowHostedJobLockService
-        // Register EF-based projection/retention stores
+        services.AddWorkflowModule("workflow-store.oracle", "1.0.0");
+        services.AddSingleton<IWorkflowBackendRegistrationMarker>(
+            new WorkflowBackendRegistrationMarker(WorkflowBackendNames.Oracle));
+
+        if (!string.Equals(configuration.GetWorkflowBackendProvider(), WorkflowBackendNames.Oracle, StringComparison.OrdinalIgnoreCase))
+        {
+            return services;
+        }
+
+        services.AddDbContext<WorkflowDbContext>(options =>
+        {
+            var connectionString = configuration.GetConnectionString("WorkflowOracle")
+                ?? configuration.GetConnectionString("Default");
+            if (!string.IsNullOrWhiteSpace(connectionString))
+            {
+                options.UseOracle(connectionString);
+            }
+        });
+        services.Replace(ServiceDescriptor.Scoped<IWorkflowRuntimeStateStore, OracleWorkflowRuntimeStateStore>());
+        services.Replace(ServiceDescriptor.Scoped<IWorkflowHostedJobLockService, OracleWorkflowHostedJobLockService>());
+
         return services;
     }
 }

src/Workflow/__Plugins/StellaOps.Workflow.Plugin.WorkflowStore.Mongo/ServiceRegistrator.cs

@@ -0,0 +1,16 @@
+using StellaOps.DependencyInjection;
+using StellaOps.Workflow.Abstractions;
+using StellaOps.Workflow.DataStore.MongoDB;
+
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace StellaOps.Workflow.Plugin.WorkflowStore.Mongo;
+
+public sealed class ServiceRegistrator : IDependencyInjectionRoutine
+{
+    public IServiceCollection Register(IServiceCollection services, IConfiguration configuration)
+    {
+        return services.AddWorkflowMongoDataStore(configuration);
+    }
+}

src/Workflow/__Plugins/StellaOps.Workflow.Plugin.WorkflowStore.Mongo/StellaOps.Workflow.Plugin.WorkflowStore.Mongo.csproj

@@ -0,0 +1,37 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <ProduceReferenceAssembly>false</ProduceReferenceAssembly>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <EnableDynamicLoading>true</EnableDynamicLoading>
+    <Nullable>enable</Nullable>
+    <ManagePackageVersionsCentrally>false</ManagePackageVersionsCentrally>
+    <DisableFastUpToDateCheck>true</DisableFastUpToDateCheck>
+    <CopyPluginBinariesToPath Condition="'$(CopyPluginBinariesToPath)' == ''">$([System.IO.Path]::Combine($(MSBuildProjectDirectory),'..','..','StellaOps.Workflow.WebService','PluginBinaries','$(MSBuildProjectName)'))</CopyPluginBinariesToPath>
+  </PropertyGroup>
+
+  <Target Name="CopyPluginBinaries" AfterTargets="Build">
+    <ItemGroup>
+      <BuiltFiles Include="$(TargetDir)**\*.*" />
+    </ItemGroup>
+
+    <RemoveDir Directories="$(CopyPluginBinariesToPath)" Condition="Exists('$(CopyPluginBinariesToPath)')" />
+    <MakeDir Directories="$(CopyPluginBinariesToPath)" />
+    <Copy SourceFiles="@(BuiltFiles)" DestinationFolder="$(CopyPluginBinariesToPath)" SkipUnchangedFiles="false" />
+  </Target>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\__Libraries\StellaOps.Workflow.DataStore.MongoDB\StellaOps.Workflow.DataStore.MongoDB.csproj">
+      <Private>false</Private>
+      <ExcludeAssets>runtime</ExcludeAssets>
+    </ProjectReference>
+    <ProjectReference Include="..\..\__Libraries\StellaOps.Workflow.Abstractions\StellaOps.Workflow.Abstractions.csproj">
+      <Private>false</Private>
+      <ExcludeAssets>runtime</ExcludeAssets>
+    </ProjectReference>
+    <ProjectReference Include="..\..\..\__Libraries\StellaOps.DependencyInjection\StellaOps.DependencyInjection.csproj">
+      <Private>false</Private>
+      <ExcludeAssets>runtime</ExcludeAssets>
+    </ProjectReference>
+  </ItemGroup>
+</Project>

src/Workflow/__Plugins/StellaOps.Workflow.Plugin.WorkflowStore.Oracle/ServiceRegistrator.cs

@@ -0,0 +1,45 @@
+using StellaOps.DependencyInjection;
+using StellaOps.Workflow.Abstractions;
+using StellaOps.Workflow.DataStore.Oracle;
+using StellaOps.Workflow.Signaling.OracleAq;
+
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+using Microsoft.Extensions.DependencyInjection.Extensions;
+
+namespace StellaOps.Workflow.Plugin.WorkflowStore.Oracle;
+
+public sealed class ServiceRegistrator : IDependencyInjectionRoutine
+{
+    public IServiceCollection Register(IServiceCollection services, IConfiguration configuration)
+    {
+        services.AddWorkflowOracleDataStore(configuration);
+
+        if (!string.Equals(configuration.GetWorkflowBackendProvider(), WorkflowBackendNames.Oracle, StringComparison.OrdinalIgnoreCase))
+        {
+            return services;
+        }
+
+        var useNativeSignalDriver = string.Equals(
+            configuration.GetWorkflowSignalDriverProvider(),
+            WorkflowSignalDriverNames.Native,
+            StringComparison.OrdinalIgnoreCase);
+
+        services.AddScoped<IOracleAqTransport, OracleManagedAqTransport>();
+        services.AddScoped<OracleAqWorkflowSignalBus>();
+        services.AddScoped<OracleAqWorkflowScheduleBus>();
+        services.Replace(ServiceDescriptor.Scoped<IWorkflowSignalStore>(sp => sp.GetRequiredService<OracleAqWorkflowSignalBus>()));
+        services.Replace(ServiceDescriptor.Scoped<IWorkflowSignalClaimStore>(sp => sp.GetRequiredService<OracleAqWorkflowSignalBus>()));
+        services.Replace(ServiceDescriptor.Scoped<IWorkflowSignalScheduler>(sp => sp.GetRequiredService<OracleAqWorkflowScheduleBus>()));
+        services.Replace(ServiceDescriptor.Scoped<IWorkflowSignalDeadLetterStore, OracleAqWorkflowSignalDeadLetterStore>());
+        if (useNativeSignalDriver)
+        {
+            services.Replace(ServiceDescriptor.Scoped<IWorkflowSignalDriver>(sp => sp.GetRequiredService<OracleAqWorkflowSignalBus>()));
+        }
+
+        services.AddSingleton<IWorkflowSignalDriverRegistrationMarker>(
+            new WorkflowSignalDriverRegistrationMarker(WorkflowSignalDriverNames.Native));
+
+        return services;
+    }
+}

src/Workflow/__Plugins/StellaOps.Workflow.Plugin.WorkflowStore.Oracle/StellaOps.Workflow.Plugin.WorkflowStore.Oracle.csproj

@@ -0,0 +1,45 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <ProduceReferenceAssembly>false</ProduceReferenceAssembly>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <EnableDynamicLoading>true</EnableDynamicLoading>
+    <Nullable>enable</Nullable>
+    <ManagePackageVersionsCentrally>false</ManagePackageVersionsCentrally>
+    <DisableFastUpToDateCheck>true</DisableFastUpToDateCheck>
+    <CopyPluginBinariesToPath Condition="'$(CopyPluginBinariesToPath)' == ''">$([System.IO.Path]::Combine($(MSBuildProjectDirectory),'..','..','StellaOps.Workflow.WebService','PluginBinaries','$(MSBuildProjectName)'))</CopyPluginBinariesToPath>
+  </PropertyGroup>
+
+  <Target Name="CopyPluginBinaries" AfterTargets="Build">
+    <ItemGroup>
+      <BuiltFiles Include="$(TargetDir)**\*.*" />
+    </ItemGroup>
+
+    <RemoveDir Directories="$(CopyPluginBinariesToPath)" Condition="Exists('$(CopyPluginBinariesToPath)')" />
+    <MakeDir Directories="$(CopyPluginBinariesToPath)" />
+    <Copy SourceFiles="@(BuiltFiles)" DestinationFolder="$(CopyPluginBinariesToPath)" SkipUnchangedFiles="false" />
+  </Target>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\__Libraries\StellaOps.Workflow.Engine\StellaOps.Workflow.Engine.csproj">
+      <Private>false</Private>
+      <ExcludeAssets>runtime</ExcludeAssets>
+    </ProjectReference>
+    <ProjectReference Include="..\..\__Libraries\StellaOps.Workflow.DataStore.Oracle\StellaOps.Workflow.DataStore.Oracle.csproj">
+      <Private>false</Private>
+      <ExcludeAssets>runtime</ExcludeAssets>
+    </ProjectReference>
+    <ProjectReference Include="..\..\__Libraries\StellaOps.Workflow.Signaling.OracleAq\StellaOps.Workflow.Signaling.OracleAq.csproj">
+      <Private>false</Private>
+      <ExcludeAssets>runtime</ExcludeAssets>
+    </ProjectReference>
+    <ProjectReference Include="..\..\__Libraries\StellaOps.Workflow.Abstractions\StellaOps.Workflow.Abstractions.csproj">
+      <Private>false</Private>
+      <ExcludeAssets>runtime</ExcludeAssets>
+    </ProjectReference>
+    <ProjectReference Include="..\..\..\__Libraries\StellaOps.DependencyInjection\StellaOps.DependencyInjection.csproj">
+      <Private>false</Private>
+      <ExcludeAssets>runtime</ExcludeAssets>
+    </ProjectReference>
+  </ItemGroup>
+</Project>

src/Workflow/__Plugins/StellaOps.Workflow.Plugin.WorkflowStore.Postgres/ServiceRegistrator.cs

@@ -0,0 +1,16 @@
+using StellaOps.DependencyInjection;
+using StellaOps.Workflow.Abstractions;
+using StellaOps.Workflow.DataStore.PostgreSQL;
+
+using Microsoft.Extensions.Configuration;
+using Microsoft.Extensions.DependencyInjection;
+
+namespace StellaOps.Workflow.Plugin.WorkflowStore.Postgres;
+
+public sealed class ServiceRegistrator : IDependencyInjectionRoutine
+{
+    public IServiceCollection Register(IServiceCollection services, IConfiguration configuration)
+    {
+        return services.AddWorkflowPostgresDataStore(configuration);
+    }
+}

src/Workflow/__Plugins/StellaOps.Workflow.Plugin.WorkflowStore.Postgres/StellaOps.Workflow.Plugin.WorkflowStore.Postgres.csproj

@@ -0,0 +1,37 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net10.0</TargetFramework>
+    <ProduceReferenceAssembly>false</ProduceReferenceAssembly>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <EnableDynamicLoading>true</EnableDynamicLoading>
+    <Nullable>enable</Nullable>
+    <ManagePackageVersionsCentrally>false</ManagePackageVersionsCentrally>
+    <DisableFastUpToDateCheck>true</DisableFastUpToDateCheck>
+    <CopyPluginBinariesToPath Condition="'$(CopyPluginBinariesToPath)' == ''">$([System.IO.Path]::Combine($(MSBuildProjectDirectory),'..','..','StellaOps.Workflow.WebService','PluginBinaries','$(MSBuildProjectName)'))</CopyPluginBinariesToPath>
+  </PropertyGroup>
+
+  <Target Name="CopyPluginBinaries" AfterTargets="Build">
+    <ItemGroup>
+      <BuiltFiles Include="$(TargetDir)**\*.*" />
+    </ItemGroup>
+
+    <RemoveDir Directories="$(CopyPluginBinariesToPath)" Condition="Exists('$(CopyPluginBinariesToPath)')" />
+    <MakeDir Directories="$(CopyPluginBinariesToPath)" />
+    <Copy SourceFiles="@(BuiltFiles)" DestinationFolder="$(CopyPluginBinariesToPath)" SkipUnchangedFiles="false" />
+  </Target>
+
+  <ItemGroup>
+    <ProjectReference Include="..\..\__Libraries\StellaOps.Workflow.DataStore.PostgreSQL\StellaOps.Workflow.DataStore.PostgreSQL.csproj">
+      <Private>false</Private>
+      <ExcludeAssets>runtime</ExcludeAssets>
+    </ProjectReference>
+    <ProjectReference Include="..\..\__Libraries\StellaOps.Workflow.Abstractions\StellaOps.Workflow.Abstractions.csproj">
+      <Private>false</Private>
+      <ExcludeAssets>runtime</ExcludeAssets>
+    </ProjectReference>
+    <ProjectReference Include="..\..\..\__Libraries\StellaOps.DependencyInjection\StellaOps.DependencyInjection.csproj">
+      <Private>false</Private>
+      <ExcludeAssets>runtime</ExcludeAssets>
+    </ProjectReference>
+  </ItemGroup>
+</Project>