semi implemented and features implemented save checkpoint

docs/features/unchecked/cli/kms-key-export-import-cli.md

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+# KMS Key Export/Import CLI
+
+## Module
+Cli
+
+## Status
+IMPLEMENTED
+
+## Description
+File-backed signing key management via export/import with passphrase protection, version selection, and force-overwrite options for portable key bundles.
+
+## Implementation Details
+- **Command Group**: `src/Cli/StellaOps.Cli/Commands/CryptoCommandGroup.cs` -- `CryptoCommandGroup` for crypto operations
+- **Command Handlers**: `src/Cli/StellaOps.Cli/Commands/CommandHandlers.Crypto.cs` -- crypto handlers
+- **Crypto Profile Validator**: `src/Cli/StellaOps.Cli/Services/CryptoProfileValidator.cs` -- crypto profile validation
+- **Tests**: `src/Cli/__Tests/StellaOps.Cli.Tests/CryptoCommandTests.cs`
+- **Commands**:
+  - `stella crypto export --key <key-id> --output <path> --passphrase <pass>` -- export signing key with passphrase protection. Options: `--version <ver>`, `--force`
+  - `stella crypto import --file <path> --passphrase <pass>` -- import signing key from file
+
+## E2E Test Plan
+- [ ] Run `stella crypto export --key <id> --output ./key.enc --passphrase "secret"` and verify encrypted key exported
+- [ ] Run `stella crypto import --file ./key.enc --passphrase "secret"` and verify key imported
+- [ ] Verify wrong passphrase fails import with clear error
+- [ ] Run with `--version 2` and verify specific version exported
+- [ ] Run with `--force` and verify overwrite of existing file
+- [ ] Verify imported key can be used for signing operations