semi implemented and features implemented save checkpoint

docs/features/unchecked/cli/cli-plugin-module-loading-architecture.md

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+# CLI Plugin Module Loading Architecture
+
+## Module
+Cli
+
+## Status
+IMPLEMENTED
+
+## Description
+Plugin-based module loading for CLI commands, enabling extensible command registration and routing.
+
+## Implementation Details
+- **Plugin System**: `src/Cli/StellaOps.Cli/Plugins/` -- plugin loading infrastructure
+- **Plugin Directory**: `src/Cli/plugins/` -- plugin module implementations
+- **Plugin Guard**: `src/Cli/__Tests/StellaOps.Cli.Tests/Plugins/RestartOnlyCliPluginGuardTests.cs` -- plugin security guard
+- **Module Loader**: `src/Cli/__Tests/StellaOps.Cli.Tests/Plugins/CliCommandModuleLoaderTests.cs` -- module loader tests
+- **Architecture**:
+  - `ICliCommandModule` interface defines plugin contract
+  - Dynamic module loader discovers and loads plugin assemblies
+  - Plugins register commands into the CLI command tree
+  - Restart-only guard prevents hot-loading for security
+- **Built-in plugins**: VEX, verdict, timestamp, symbols, AOC, delta signatures
+
+## E2E Test Plan
+- [ ] Verify built-in plugin modules are loaded at startup
+- [ ] Verify plugin commands appear in `stella --help` output
+- [ ] Verify plugin command execution works correctly
+- [ ] Verify restart-only guard prevents unauthorized plugin loading
+- [ ] Verify missing plugin gracefully reports error without crashing
+- [ ] Verify plugin loading order is deterministic