semi implemented and features implemented save checkpoint

docs/features/unchecked/scanner/policy-version-binding-to-reachability-slices.md

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+# Policy Version Binding to Reachability Slices (strict/forward/any)
+
+## Module
+Scanner
+
+## Status
+IMPLEMENTED
+
+## Description
+Binds reachability slices to specific policy versions with three validation modes: strict (invalidate on any policy change), forward (valid with newer versions), and any (valid with any version). Production defaults to strict mode.
+
+## Implementation Details
+- **Policy Binding**:
+  - `src/Scanner/__Libraries/StellaOps.Scanner.Reachability/Slices/PolicyBinding.cs` - `PolicyBinding` binds reachability slices to specific policy versions with three validation modes: strict (invalidate on any policy change), forward (valid with newer versions), and any (valid with any version)
+- **Slice Schema**:
+  - `src/Scanner/__Libraries/StellaOps.Scanner.Reachability/Slices/SliceSchema.cs` - `SliceSchema` includes policy version binding metadata in slice definitions
+
+## E2E Test Plan
+- [ ] Create a reachability slice with strict policy binding and verify it is invalidated when the policy version changes
+- [ ] Create a reachability slice with forward binding and verify it remains valid when the policy version is incremented
+- [ ] Create a reachability slice with forward binding and verify it is invalidated when the policy version is rolled back
+- [ ] Create a reachability slice with "any" binding and verify it remains valid regardless of policy version changes
+- [ ] Verify production defaults to strict mode when no binding mode is explicitly specified
+- [ ] Verify invalidated slices trigger re-computation of reachability analysis