feat(audit): Apply TreatWarningsAsErrors=true to 160+ production csproj files

Sprint: SPRINT_20251229_049_BE_csproj_audit_maint_tests
Tasks: AUDIT-0001 through AUDIT-0147 APPLY tasks (approved decisions 1-9)

Changes:
- Set TreatWarningsAsErrors=true for all production .NET projects
- Fixed nullable warnings in Scanner.EntryTrace, Scanner.Evidence,
  Scheduler.Worker, Concelier connectors, and other modules
- Injected TimeProvider/IGuidProvider for deterministic time/ID generation
- Added path traversal validation in AirGap.Bundle
- Fixed NULL handling in various cursor classes
- Third-party GostCryptography retains TreatWarningsAsErrors=false (preserves original)
- Test projects excluded per user decision (rejected decision 10)

Note: All 17 ACSC connector tests pass after snapshot fixture sync

src/EvidenceLocker/StellaOps.EvidenceLocker/Api/VerdictEndpoints.cs

@@ -20,8 +20,7 @@ public static class VerdictEndpoints
     public static void MapVerdictEndpoints(this WebApplication app)
     {
         var group = app.MapGroup("/api/v1/verdicts")
-            .WithTags("Verdicts")
-            .WithOpenApi();
+            .WithTags("Verdicts");
 
         // POST /api/v1/verdicts
         group.MapPost("/", StoreVerdictAsync)

src/EvidenceLocker/StellaOps.EvidenceLocker/StellaOps.EvidenceLocker.Core/StellaOps.EvidenceLocker.Core.csproj

@@ -5,7 +5,7 @@
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
     <LangVersion>preview</LangVersion>
-    <TreatWarningsAsErrors>false</TreatWarningsAsErrors>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
   </PropertyGroup>
 
   <ItemGroup>

src/EvidenceLocker/StellaOps.EvidenceLocker/StellaOps.EvidenceLocker.Infrastructure/StellaOps.EvidenceLocker.Infrastructure.csproj

@@ -5,7 +5,7 @@
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
     <LangVersion>preview</LangVersion>
-    <TreatWarningsAsErrors>false</TreatWarningsAsErrors>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
   </PropertyGroup>
 
   <ItemGroup>

src/EvidenceLocker/StellaOps.EvidenceLocker/StellaOps.EvidenceLocker.WebService/Program.cs

@@ -47,7 +47,7 @@ builder.Services.AddOpenApi();
 var routerOptions = builder.Configuration.GetSection("EvidenceLocker:Router").Get<StellaRouterOptionsBase>();
 builder.Services.TryAddStellaRouter(
     serviceName: "evidencelocker",
-    version: typeof(Program).Assembly.GetName().Version?.ToString() ?? "1.0.0",
+    version: typeof(StellaOps.EvidenceLocker.WebService.Program).Assembly.GetName().Version?.ToString() ?? "1.0.0",
     routerOptions: routerOptions);
 
 var app = builder.Build();

src/EvidenceLocker/StellaOps.EvidenceLocker/StellaOps.EvidenceLocker.WebService/StellaOps.EvidenceLocker.WebService.csproj

@@ -6,7 +6,7 @@
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
     <LangVersion>preview</LangVersion>
-    <TreatWarningsAsErrors>false</TreatWarningsAsErrors>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
   </PropertyGroup>
   <ItemGroup>
     <PackageReference Include="Microsoft.AspNetCore.OpenApi" />

src/EvidenceLocker/StellaOps.EvidenceLocker/StellaOps.EvidenceLocker.Worker/StellaOps.EvidenceLocker.Worker.csproj

@@ -13,7 +13,7 @@
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
     <LangVersion>preview</LangVersion>
-    <TreatWarningsAsErrors>false</TreatWarningsAsErrors>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
   </PropertyGroup>
   
 

src/EvidenceLocker/StellaOps.EvidenceLocker/StellaOps.EvidenceLocker.csproj

@@ -5,7 +5,7 @@
     <ImplicitUsings>enable</ImplicitUsings>
     <Nullable>enable</Nullable>
     <LangVersion>preview</LangVersion>
-    <TreatWarningsAsErrors>false</TreatWarningsAsErrors>
+    <TreatWarningsAsErrors>true</TreatWarningsAsErrors>
   </PropertyGroup>
 
   <!-- Exclude subprojects from compilation - they have their own .csproj files -->