The PII sanitizer's phone regex matches digit pairs like "4880-8614"
that span UUID segment boundaries. Random UUIDs occasionally produce
these patterns, causing flaky test failures where sourceRun.id gets
partially redacted as [REDACTED_PHONE].
Use a fixed hex-letter-heavy UUID for runId so no cross-boundary
digit sequence triggers the phone pattern.
Co-Authored-By: Paperclip <noreply@paperclip.ing>