semi implemented and features implemented save checkpoint

docs/features/unchecked/scanner/path-explanation-service-with-multi-format-rendering.md

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+# Path Explanation Service with Multi-Format Rendering
+
+## Module
+Scanner
+
+## Status
+IMPLEMENTED
+
+## Description
+Service that converts raw reachability graph paths (entrypoint-to-sink) into human-readable explanations with gate annotations, supporting text, markdown, and JSON output formats for display in CLI, UI, and API responses.
+
+## Implementation Details
+- **Path Explanation Service**:
+  - `src/Scanner/__Libraries/StellaOps.Scanner.Reachability/Explanation/PathExplanationService.cs` - `PathExplanationService` converts raw reachability graph paths into human-readable explanations with gate annotations
+  - `src/Scanner/__Libraries/StellaOps.Scanner.Reachability/Explanation/PathExplanationModels.cs` - Models for path explanation data including node descriptions, gate annotations, and confidence levels
+- **Multi-Format Rendering**:
+  - `src/Scanner/__Libraries/StellaOps.Scanner.Reachability/Explanation/PathRenderer.cs` - `PathRenderer` renders path explanations in multiple formats: plain text, markdown, and JSON for CLI, UI, and API consumption
+
+## E2E Test Plan
+- [ ] Generate a reachability path from an entrypoint to a vulnerable sink and verify the explanation service produces a human-readable description
+- [ ] Verify gate annotations (auth, admin-only, feature flags) appear in the path explanation
+- [ ] Verify text format rendering produces a clean CLI-readable output
+- [ ] Verify markdown format rendering produces properly formatted markdown with code blocks and links
+- [ ] Verify JSON format rendering produces structured data suitable for API responses and UI consumption
+- [ ] Verify multi-hop paths (entrypoint -> intermediate -> sink) include all intermediate nodes with descriptions