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/formatters/output.test.ts

@@ -0,0 +1,41 @@
+import { describe, it, expect } from 'vitest';
+import { formatJson, formatYaml } from '../../src/formatters/output.js';
+
+describe('formatJson', () => {
+  it('formats object as indented JSON', () => {
+    const result = formatJson({ key: 'value', num: 42 });
+    expect(JSON.parse(result)).toEqual({ key: 'value', num: 42 });
+    expect(result).toContain('\n'); // indented
+  });
+
+  it('formats arrays', () => {
+    const result = formatJson([1, 2, 3]);
+    expect(JSON.parse(result)).toEqual([1, 2, 3]);
+  });
+
+  it('handles null and undefined values', () => {
+    const result = formatJson({ a: null, b: undefined });
+    const parsed = JSON.parse(result) as Record<string, unknown>;
+    expect(parsed['a']).toBeNull();
+    expect('b' in parsed).toBe(false); // undefined stripped by JSON
+  });
+});
+
+describe('formatYaml', () => {
+  it('formats object as YAML', () => {
+    const result = formatYaml({ key: 'value', num: 42 });
+    expect(result).toContain('key: value');
+    expect(result).toContain('num: 42');
+  });
+
+  it('formats arrays', () => {
+    const result = formatYaml(['a', 'b']);
+    expect(result).toContain('- a');
+    expect(result).toContain('- b');
+  });
+
+  it('does not end with trailing newline', () => {
+    const result = formatYaml({ x: 1 });
+    expect(result.endsWith('\n')).toBe(false);
+  });
+});

src/cli/tests/formatters/table.test.ts

@@ -0,0 +1,87 @@
+import { describe, it, expect } from 'vitest';
+import { formatTable } from '../../src/formatters/table.js';
+import type { Column } from '../../src/formatters/table.js';
+
+interface TestRow {
+  name: string;
+  age: number;
+  city: string;
+}
+
+const columns: Column<TestRow>[] = [
+  { header: 'NAME', key: 'name' },
+  { header: 'AGE', key: 'age', align: 'right' },
+  { header: 'CITY', key: 'city' },
+];
+
+describe('formatTable', () => {
+  it('returns empty message for no rows', () => {
+    expect(formatTable([], columns)).toBe('No results found.');
+  });
+
+  it('formats a single row', () => {
+    const rows = [{ name: 'Alice', age: 30, city: 'NYC' }];
+    const result = formatTable(rows, columns);
+    const lines = result.split('\n');
+    expect(lines).toHaveLength(3); // header, separator, data
+    expect(lines[0]).toContain('NAME');
+    expect(lines[0]).toContain('AGE');
+    expect(lines[0]).toContain('CITY');
+    expect(lines[2]).toContain('Alice');
+    expect(lines[2]).toContain('NYC');
+  });
+
+  it('right-aligns numeric columns', () => {
+    const rows = [{ name: 'Bob', age: 5, city: 'LA' }];
+    const result = formatTable(rows, columns);
+    const lines = result.split('\n');
+    // AGE column should be right-aligned: " 5" or "5" padded
+    const ageLine = lines[2];
+    // The age value should have leading space(s) for right alignment
+    expect(ageLine).toMatch(/\s+5/);
+  });
+
+  it('auto-sizes columns to content', () => {
+    const rows = [
+      { name: 'A', age: 1, city: 'X' },
+      { name: 'LongName', age: 100, city: 'LongCityName' },
+    ];
+    const result = formatTable(rows, columns);
+    const lines = result.split('\n');
+    // Header should be at least as wide as longest data
+    expect(lines[0]).toContain('NAME');
+    expect(lines[2]).toContain('A');
+    expect(lines[3]).toContain('LongName');
+    expect(lines[3]).toContain('LongCityName');
+  });
+
+  it('truncates long values when width is fixed', () => {
+    const narrowCols: Column<TestRow>[] = [
+      { header: 'NAME', key: 'name', width: 5 },
+    ];
+    const rows = [{ name: 'VeryLongName', age: 0, city: '' }];
+    const result = formatTable(rows, narrowCols);
+    const lines = result.split('\n');
+    // Should be truncated with ellipsis
+    expect(lines[2].trim().length).toBeLessThanOrEqual(5);
+    expect(lines[2]).toContain('\u2026');
+  });
+
+  it('supports function-based column keys', () => {
+    const fnCols: Column<TestRow>[] = [
+      { header: 'INFO', key: (row) => `${row.name} (${row.age})` },
+    ];
+    const rows = [{ name: 'Eve', age: 25, city: 'SF' }];
+    const result = formatTable(rows, fnCols);
+    expect(result).toContain('Eve (25)');
+  });
+
+  it('handles separator line matching column widths', () => {
+    const rows = [{ name: 'Test', age: 1, city: 'Here' }];
+    const result = formatTable(rows, columns);
+    const lines = result.split('\n');
+    const separator = lines[1];
+    // Separator should consist of dashes and spaces
+    expect(separator).toMatch(/^[-\s]+$/);
+  });
+});