semi implemented and features implemented save checkpoint

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

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+# Audit - StellaOps.Plugin
+
+## Project
+- Path: `src/__Libraries/StellaOps.Plugin/StellaOps.Plugin.csproj`
+- Module: `__Libraries`
+- Kind: `Library`
+- 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: 8
+- Service locator usage (BuildServiceProvider/GetService): 0
+- Analyzer enforcement: missing repo-wide (see summary).
+
+### Details
+- 100-line files:
+  - `src/__Libraries/StellaOps.Plugin/Manifest/PluginManifestLoader.cs` (524 lines)
+  - `src/__Libraries/StellaOps.Plugin/Hosting/PluginHost.cs` (340 lines)
+  - `src/__Libraries/StellaOps.Plugin/Manifest/PluginRegistry.cs` (287 lines)
+  - `src/__Libraries/StellaOps.Plugin/Security/CosignPluginVerifier.cs` (260 lines)
+  - `src/__Libraries/StellaOps.Plugin/Manifest/PluginManifest.cs` (233 lines)
+  - `src/__Libraries/StellaOps.Plugin/Versioning/PluginCompatibilityChecker.cs` (209 lines)
+  - `src/__Libraries/StellaOps.Plugin/PluginContracts.cs` (172 lines)
+  - `src/__Libraries/StellaOps.Plugin/DependencyInjection/PluginServiceRegistration.cs` (169 lines)
+- Service locator matches:
+  - none
+
+### Fix Guidance
+- Split files over 100 lines into smaller types or partials.
+
+## Testing Fullness Findings
+- Status: PASS
+- Expected layers: Unit
+- Detected test projects: docs/dev/sdks/plugin-templates/stellaops-plugin-scheduler/__Tests/StellaOps.Plugin.MyJob.Tests/StellaOps.Plugin.MyJob.Tests.csproj [Unit], docs/dev/sdks/plugin-templates/stellaops-plugin-connector/__Tests/StellaOps.Plugin.MyConnector.Tests/StellaOps.Plugin.MyConnector.Tests.csproj [Unit], src/__Libraries/__Tests/StellaOps.Plugin.Tests/StellaOps.Plugin.Tests.csproj [Unit], src/Plugin/__Tests/StellaOps.Plugin.Sdk.Tests/StellaOps.Plugin.Sdk.Tests.csproj [Unit], src/Plugin/__Tests/StellaOps.Plugin.Sandbox.Tests/StellaOps.Plugin.Sandbox.Tests.csproj [Unit], src/Plugin/__Tests/StellaOps.Plugin.Registry.Tests/StellaOps.Plugin.Registry.Tests.csproj [Unit], src/Plugin/__Tests/StellaOps.Plugin.Host.Tests/StellaOps.Plugin.Host.Tests.csproj [Unit], src/Plugin/__Tests/StellaOps.Plugin.Abstractions.Tests/StellaOps.Plugin.Abstractions.Tests.csproj [Unit], src/Plugin/Samples/StellaOps.Plugin.Samples.HelloWorld.Tests/StellaOps.Plugin.Samples.HelloWorld.Tests.csproj [Unit]
+- Missing layers: none
+
+### Manual checks required
+- Observability contract tests for WebService/Worker.
+- Offline execution (tests must run without network access).
+
+### Fix Guidance
+- None.