semi implemented and features implemented save checkpoint

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

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+# Audit - StellaOps.VersionComparison
+
+## Project
+- Path: `src/__Libraries/StellaOps.VersionComparison/StellaOps.VersionComparison.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: 5
+- Service locator usage (BuildServiceProvider/GetService): 0
+- Analyzer enforcement: missing repo-wide (see summary).
+
+### Details
+- 100-line files:
+  - `src/__Libraries/StellaOps.VersionComparison/Comparers/DebianVersionComparer.cs` (261 lines)
+  - `src/__Libraries/StellaOps.VersionComparison/Comparers/RpmVersionComparer.cs` (259 lines)
+  - `src/__Libraries/StellaOps.VersionComparison/Models/ApkVersion.cs` (158 lines)
+  - `src/__Libraries/StellaOps.VersionComparison/Models/RpmVersion.cs` (130 lines)
+  - `src/__Libraries/StellaOps.VersionComparison/Models/DebianVersion.cs` (126 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: src/__Libraries/__Tests/StellaOps.VersionComparison.Tests/StellaOps.VersionComparison.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.