feat: add instance lifecycle management with restart, inspect, and CLI commands

Adds restart/inspect methods to InstanceService, state validation for stop,
REST endpoints for restart and inspect, and full CLI command suite for
instance list/start/stop/restart/remove/logs/inspect.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

src/cli/src/index.ts

@@ -5,6 +5,7 @@ import { createConfigCommand } from './commands/config.js';
 import { createStatusCommand } from './commands/status.js';
 import { createGetCommand } from './commands/get.js';
 import { createDescribeCommand } from './commands/describe.js';
+import { createInstanceCommands } from './commands/instances.js';
 import { ApiClient } from './api-client.js';
 import { loadConfig } from './config/index.js';
 
@@ -46,6 +47,11 @@ export function createProgram(): Command {
     log: (...args) => console.log(...args),
   }));
 
+  program.addCommand(createInstanceCommands({
+    client,
+    log: (...args) => console.log(...args),
+  }));
+
   return program;
 }