partly or unimplemented features - now implemented

docs/features/unchecked/cli/baseline-selection-logic.md

@@ -0,0 +1,37 @@
+# Baseline Selection Logic (Last Green / Previous Release)
+
+## Module
+Cli
+
+## Status
+IMPLEMENTED
+
+## Description
+Compare feature infrastructure exists with services and CLI builder. The specific baseline selection logic (last green verdict, previous release tag) and its visibility to users may be partially implemented.
+
+## What's Implemented
+- **Compare Command Builder**: `src/Cli/StellaOps.Cli/Commands/Compare/CompareCommandBuilder.cs` -- `CompareCommandBuilder` (internal static class)
+  - Sprint: SPRINT_4200_0002_0004_cli_compare
+  - Implements `stella compare --base <digest> --target <digest>` with options: `--output table|json|sarif`, `--output-file <path>`, `--include-unchanged`
+  - Requires explicit `--base` and `--target` digest arguments (manual selection)
+- **Delta Scan**: `src/Cli/StellaOps.Cli/Commands/Scan/DeltaScanCommandGroup.cs` -- delta scan with baseline comparison
+- **VEX Gen Baseline**: `src/Cli/StellaOps.Cli/Commands/VexGenCommandGroup.cs` -- `--baseline <sealId>` option for facet drift baseline; defaults to latest seal for image
+- **Seal Store**: `IFacetSealStore.GetLatestSealAsync()` for retrieving most recent baseline
+
+## What's Missing
+- **Automatic "last green" selection**: No command or flag like `--baseline last-green` that automatically selects the most recent scan digest with a passing verdict
+- **Previous release tag resolution**: No `--baseline previous-release` that resolves the previous release tag from SCM/registry metadata
+- **Baseline suggestion in output**: Compare results do not suggest a recommended baseline when none is specified
+- **UI baseline picker**: Web UI does not surface baseline selection with "last green" / "previous release" presets
+
+## Implementation Plan
+- Add `--baseline-strategy last-green|previous-release|explicit` option to compare and delta-scan commands
+- Implement `IBaselineResolver` service with strategies for "last green verdict" (query verdict store for latest pass) and "previous release" (query registry for previous tag)
+- Wire baseline resolver into `CompareCommandBuilder` and `DeltaScanCommandGroup`
+- Add baseline suggestion panel to Web UI compare view
+- Add tests for each baseline strategy
+
+## Related Documentation
+- Compare command: `src/Cli/StellaOps.Cli/Commands/Compare/CompareCommandBuilder.cs`
+- Delta scan: `src/Cli/StellaOps.Cli/Commands/Scan/DeltaScanCommandGroup.cs`
+- VEX gen baseline: `src/Cli/StellaOps.Cli/Commands/VexGenCommandGroup.cs`