Address code review findings: remove unreachable code and fix style issues

[Copilot]

Addresses four code review findings from PR #56: unreachable return statement, inconsistent comment indentation, and non-idiomatic module imports in tests.

Changes:

• Remove unreachable code in ddev-utils.ts:218: The return result.stdout; statement was dead code—when result.status === 0, execution returns earlier via the allowedExitCodes check (line 203); when result.status !== 0, an error is thrown (line 215).

• Fix comment indentation in ddev-utils.ts: Removed extra leading spaces from comments at lines 207 and 220 to align with surrounding code.

• Modernize imports in ddev-utils.test.ts: Replaced require() calls for child_process and fs with ES6 imports, eliminating the need for runtime require statements in beforeEach.

// Before
beforeEach(() => {
    const cp = require('child_process');
    const fs = require('fs');
    spawnSyncStub = sandbox.stub(cp, 'spawnSync');
});

// After
import * as cp from 'child_process';
import * as fs from 'fs';

beforeEach(() => {
    spawnSyncStub = sandbox.stub(cp, 'spawnSync');
});

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