feat: build CLI core framework with Commander.js

Add CLI entry point with Commander.js, config management (~/.mcpctl/config.json
with Zod validation), output formatters (table/json/yaml), config and status
commands with dependency injection for testing. Fix sanitizeString regex ordering.
67 tests passing.

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

src/cli/src/config/schema.ts

@@ -0,0 +1,22 @@
+import { z } from 'zod';
+
+export const McpctlConfigSchema = z.object({
+  /** mcpd daemon endpoint */
+  daemonUrl: z.string().default('http://localhost:3000'),
+  /** Active registries for search */
+  registries: z.array(z.enum(['official', 'glama', 'smithery'])).default(['official', 'glama', 'smithery']),
+  /** Cache TTL in milliseconds */
+  cacheTTLMs: z.number().int().positive().default(3_600_000),
+  /** HTTP proxy URL */
+  httpProxy: z.string().optional(),
+  /** HTTPS proxy URL */
+  httpsProxy: z.string().optional(),
+  /** Default output format */
+  outputFormat: z.enum(['table', 'json', 'yaml']).default('table'),
+  /** Smithery API key */
+  smitheryApiKey: z.string().optional(),
+});
+
+export type McpctlConfig = z.infer<typeof McpctlConfigSchema>;
+
+export const DEFAULT_CONFIG: McpctlConfig = McpctlConfigSchema.parse({});