semi implemented and features implemented save checkpoint

docs/features/unchecked/cli/deltasig-cli-module.md

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+# DeltaSig CLI Module
+
+## Module
+Cli
+
+## Status
+IMPLEMENTED
+
+## Description
+Proposed CLI module for creating, signing, verifying, and packing ELF delta signatures. The BinaryDiff attestation predicates exist as the backend foundation.
+
+## Implementation Details
+- **Command Group**: `src/Cli/StellaOps.Cli/Commands/DeltaSig/DeltaSigCommandGroup.cs` -- `DeltaSigCommandGroup` (internal static class)
+- **Command Handlers**: `src/Cli/StellaOps.Cli/Commands/DeltaSig/DeltaSigCommandHandlers.cs` -- `DeltaSigCommandHandlers`
+- **Binary Commands**: `src/Cli/StellaOps.Cli/Commands/Binary/DeltaSigCommandGroup.cs` -- binary-level delta sig
+- **Tests**: `src/Cli/__Tests/StellaOps.Cli.Tests/DeltaSigCommandTests.cs`
+- **Commands**:
+  - `stella deltasig create --old <binary> --new <binary>` -- create delta signature
+  - `stella deltasig sign <deltasig>` -- sign a delta signature
+  - `stella deltasig verify <deltasig>` -- verify delta signature integrity
+  - `stella deltasig pack <deltasig> --output <path>` -- pack delta signature for distribution
+
+## E2E Test Plan
+- [ ] Run `stella deltasig create --old ./v1.elf --new ./v2.elf` and verify delta signature created
+- [ ] Run `stella deltasig sign ./delta.sig` and verify cryptographic signing
+- [ ] Run `stella deltasig verify ./delta.sig` and verify signature validation
+- [ ] Run `stella deltasig pack ./delta.sig --output ./packed.tar.gz` and verify packed bundle
+- [ ] Verify verification fails for tampered delta signatures
+- [ ] Verify `--format json` output for automation