refactor: add integrationTest() helper to reduce test boilerplate

Replace repetitive Deno.test({ name, fn, sanitizeOps: false, sanitizeResources: false })
pattern across ~88 integration tests with a concise integrationTest() wrapper.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: bartlomieju