feat: Implement approvals workflow and notifications integration

- Added approvals orchestration with persistence and workflow scaffolding.
- Integrated notifications insights and staged resume hooks.
- Introduced approval coordinator and policy notification bridge with unit tests.
- Added approval decision API with resume requeue and persisted plan snapshots.
- Documented the Excitor consensus API beta and provided JSON sample payload.
- Created analyzers to flag usage of deprecated merge service APIs.
- Implemented logging for artifact uploads and approval decision service.
- Added tests for PackRunApprovalDecisionService and related components.

src/Scanner/StellaOps.Scanner.WebService/Program.cs

@@ -97,6 +97,8 @@ builder.Services.AddSurfaceEnvironment(options =>
 builder.Services.AddSurfaceValidation();
 builder.Services.AddSurfaceFileCache();
 builder.Services.AddSurfaceSecrets();
+builder.Services.AddSingleton<IConfigureOptions<SurfaceCacheOptions>>(sp =>
+    new SurfaceCacheOptionsConfigurator(sp.GetRequiredService<ISurfaceEnvironment>()));
 builder.Services.AddSingleton<ISurfacePointerService, SurfacePointerService>();
 builder.Services.AddSingleton<IRedisConnectionFactory, RedisConnectionFactory>();
 if (bootstrapOptions.Events is { Enabled: true } eventsOptions
@@ -370,5 +372,24 @@ if (resolvedOptions.Features.EnablePolicyPreview)
 apiGroup.MapReportEndpoints(resolvedOptions.Api.ReportsSegment);
 apiGroup.MapRuntimeEndpoints(resolvedOptions.Api.RuntimeSegment);
 
-app.MapOpenApiIfAvailable();
-await app.RunAsync().ConfigureAwait(false);
+app.MapOpenApiIfAvailable();
+await app.RunAsync().ConfigureAwait(false);
+
+public partial class Program;
+
+internal sealed class SurfaceCacheOptionsConfigurator : IConfigureOptions<SurfaceCacheOptions>
+{
+    private readonly ISurfaceEnvironment _surfaceEnvironment;
+
+    public SurfaceCacheOptionsConfigurator(ISurfaceEnvironment surfaceEnvironment)
+    {
+        _surfaceEnvironment = surfaceEnvironment ?? throw new ArgumentNullException(nameof(surfaceEnvironment));
+    }
+
+    public void Configure(SurfaceCacheOptions options)
+    {
+        ArgumentNullException.ThrowIfNull(options);
+        var settings = _surfaceEnvironment.Settings;
+        options.RootDirectory = settings.CacheRoot.FullName;
+    }
+}