After DC-005 refactor moved health-checker.js into src/monitoring/, the
require path was never updated. Tests in __tests__/health-checker.test.js
failed with 'Cannot find module' → 59 cascading test failures in the
health-checker suite.
Path: src/monitoring/health-checker.js → 'require(./platform-paths)'
Fix: 'require(../../platform-paths)'
Verified: 921/922 tests passing (one known async-timing flake in
logging.test.js 'writes entry to ERROR_LOG_FILE with context').