semi implemented and features implemented save checkpoint

docs/implplan-blocked/audits/csproj-standards/Plugin/StellaOps.Plugin.Host/StellaOps.Plugin.Host.md

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+# Audit - StellaOps.Plugin.Host
+
+## Project
+- Path: `src/Plugin/StellaOps.Plugin.Host/StellaOps.Plugin.Host.csproj`
+- Module: `Plugin`
+- Kind: `Plugin`
+- SDK: `Microsoft.NET.Sdk`
+- TargetFramework: `net10.0`
+- Audit date (UTC): 2026-01-30
+
+## Coding Standards Findings
+- Status: FAIL
+- Nullable: enable
+- TreatWarningsAsErrors: explicit true
+- Deterministic: inherited true
+- 100-line rule violations: 18
+- Service locator usage (BuildServiceProvider/GetService): 2
+- Analyzer enforcement: missing repo-wide (see summary).
+
+### Details
+- 100-line files:
+  - `src/Plugin/StellaOps.Plugin.Host/PluginHost.cs` (418 lines)
+  - `src/Plugin/StellaOps.Plugin.Host/Dependencies/PluginDependencyResolver.cs` (320 lines)
+  - `src/Plugin/StellaOps.Plugin.Host/Discovery/FileSystemPluginDiscovery.cs` (287 lines)
+  - `src/Plugin/StellaOps.Plugin.Host/Health/PluginHealthMonitor.cs` (253 lines)
+  - `src/Plugin/StellaOps.Plugin.Host/Dependencies/DependencyGraph.cs` (225 lines)
+  - `src/Plugin/StellaOps.Plugin.Host/Context/PluginConfiguration.cs` (221 lines)
+  - `src/Plugin/StellaOps.Plugin.Host/Loading/AssemblyPluginLoader.cs` (213 lines)
+  - `src/Plugin/StellaOps.Plugin.Host/IPluginHost.cs` (174 lines)
+  - `src/Plugin/StellaOps.Plugin.Host/Lifecycle/PluginLifecycleManager.cs` (173 lines)
+  - `src/Plugin/StellaOps.Plugin.Host/Extensions/ServiceCollectionExtensions.cs` (165 lines)
+  - `src/Plugin/StellaOps.Plugin.Host/Discovery/EmbeddedPluginDiscovery.cs` (153 lines)
+  - `src/Plugin/StellaOps.Plugin.Host/Lifecycle/PluginStateMachine.cs` (150 lines)
+  - `src/Plugin/StellaOps.Plugin.Host/Context/PluginContext.cs` (130 lines)
+  - `src/Plugin/StellaOps.Plugin.Host/Context/PluginServices.cs` (120 lines)
+  - `src/Plugin/StellaOps.Plugin.Host/PluginHostOptions.cs` (118 lines)
+  - `src/Plugin/StellaOps.Plugin.Host/Loading/PluginAssemblyLoadContext.cs` (115 lines)
+  - `src/Plugin/StellaOps.Plugin.Host/Context/PluginLogger.cs` (112 lines)
+  - `src/Plugin/StellaOps.Plugin.Host/Discovery/CompositePluginDiscovery.cs` (103 lines)
+- Service locator matches:
+  - `src/Plugin/StellaOps.Plugin.Host/Context/PluginServices.cs`:36 public T? GetService<T>() where T : class
+  - `src/Plugin/StellaOps.Plugin.Host/Context/PluginServices.cs`:39 return _serviceProvider.GetService<T>();
+
+### Fix Guidance
+- Split files over 100 lines into smaller types or partials.
+- Replace service locator usage with constructor injection.
+
+## Testing Fullness Findings
+- Status: FAIL
+- Expected layers: Unit, Integration, Security, Offline
+- Detected test projects: src/Plugin/__Tests/StellaOps.Plugin.Host.Tests/StellaOps.Plugin.Host.Tests.csproj [Unit]
+- Missing layers: Integration, Security, Offline
+
+### Manual checks required
+- Observability contract tests for WebService/Worker.
+- Offline execution (tests must run without network access).
+
+### Fix Guidance
+- Add integration tests for cross-component flows.
+- Add security tests for authn/authz or input validation.
+- Add offline/airgap coverage with fixtures only.