semi implemented and features implemented save checkpoint

docs/features/unchecked/cli/cli-slice-management-commands.md

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+# CLI Slice Management Commands
+
+## Module
+Cli
+
+## Status
+IMPLEMENTED
+
+## Description
+CLI commands for reachability slice lifecycle: query by CVE/symbol, verify DSSE signature with replay, export to offline bundle (OCI layout tar.gz), and import from bundle with integrity verification.
+
+## Implementation Details
+- **Command Group**: `src/Cli/StellaOps.Cli/Commands/Slice/` -- slice management commands
+- **Commands**:
+  - `stella slice query --cve <cve>` -- query slices by CVE
+  - `stella slice query --symbol <symbol>` -- query slices by symbol
+  - `stella slice verify <slice-id>` -- verify DSSE signature and replay integrity
+  - `stella slice export <slice-id> --output <path>` -- export to OCI layout tar.gz offline bundle
+  - `stella slice import <bundle-path>` -- import from bundle with integrity verification
+- **OCI Integration**: Exports use OCI layout format for registry compatibility
+
+## E2E Test Plan
+- [ ] Run `stella slice query --cve CVE-2024-1234` and verify matching slices returned
+- [ ] Run `stella slice query --symbol "org.example.Class.method"` and verify symbol-based query
+- [ ] Run `stella slice verify <id>` and verify DSSE signature validation
+- [ ] Run `stella slice export <id> --output ./slice-bundle.tar.gz` and verify OCI layout tar.gz
+- [ ] Run `stella slice import ./slice-bundle.tar.gz` and verify import with integrity check
+- [ ] Verify import fails for tampered bundles
+- [ ] Verify deterministic replay after import matches original