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/tests/config/loader.test.ts

@@ -0,0 +1,83 @@
+import { describe, it, expect, beforeEach, afterEach } from 'vitest';
+import { mkdtempSync, rmSync, existsSync } from 'node:fs';
+import { join } from 'node:path';
+import { tmpdir } from 'node:os';
+import { loadConfig, saveConfig, mergeConfig, getConfigPath, DEFAULT_CONFIG } from '../../src/config/index.js';
+
+let tempDir: string;
+
+beforeEach(() => {
+  tempDir = mkdtempSync(join(tmpdir(), 'mcpctl-test-'));
+});
+
+afterEach(() => {
+  rmSync(tempDir, { recursive: true, force: true });
+});
+
+describe('getConfigPath', () => {
+  it('returns path within config dir', () => {
+    const path = getConfigPath('/tmp/mcpctl');
+    expect(path).toBe('/tmp/mcpctl/config.json');
+  });
+});
+
+describe('loadConfig', () => {
+  it('returns defaults when no config file exists', () => {
+    const config = loadConfig({ configDir: tempDir });
+    expect(config).toEqual(DEFAULT_CONFIG);
+  });
+
+  it('loads config from file', () => {
+    saveConfig({ ...DEFAULT_CONFIG, daemonUrl: 'http://custom:5000' }, { configDir: tempDir });
+    const config = loadConfig({ configDir: tempDir });
+    expect(config.daemonUrl).toBe('http://custom:5000');
+  });
+
+  it('applies defaults for missing fields', () => {
+    const { writeFileSync } = require('node:fs') as typeof import('node:fs');
+    writeFileSync(join(tempDir, 'config.json'), '{"daemonUrl":"http://x:1"}');
+    const config = loadConfig({ configDir: tempDir });
+    expect(config.daemonUrl).toBe('http://x:1');
+    expect(config.registries).toEqual(['official', 'glama', 'smithery']);
+  });
+});
+
+describe('saveConfig', () => {
+  it('creates config file', () => {
+    saveConfig(DEFAULT_CONFIG, { configDir: tempDir });
+    expect(existsSync(join(tempDir, 'config.json'))).toBe(true);
+  });
+
+  it('creates config directory if missing', () => {
+    const nested = join(tempDir, 'nested', 'dir');
+    saveConfig(DEFAULT_CONFIG, { configDir: nested });
+    expect(existsSync(join(nested, 'config.json'))).toBe(true);
+  });
+
+  it('round-trips configuration', () => {
+    const custom = {
+      ...DEFAULT_CONFIG,
+      daemonUrl: 'http://custom:9000',
+      registries: ['official' as const],
+      outputFormat: 'json' as const,
+    };
+    saveConfig(custom, { configDir: tempDir });
+    const loaded = loadConfig({ configDir: tempDir });
+    expect(loaded).toEqual(custom);
+  });
+});
+
+describe('mergeConfig', () => {
+  it('merges overrides into existing config', () => {
+    saveConfig(DEFAULT_CONFIG, { configDir: tempDir });
+    const merged = mergeConfig({ daemonUrl: 'http://new:1234' }, { configDir: tempDir });
+    expect(merged.daemonUrl).toBe('http://new:1234');
+    expect(merged.registries).toEqual(DEFAULT_CONFIG.registries);
+  });
+
+  it('works when no config file exists', () => {
+    const merged = mergeConfig({ outputFormat: 'yaml' }, { configDir: tempDir });
+    expect(merged.outputFormat).toBe('yaml');
+    expect(merged.daemonUrl).toBe('http://localhost:3000');
+  });
+});