Turn an arbitrary run-id string into a short, filename-safe suffix.
Keeps ASCII word/dash characters only and caps the length at 32 to avoid
filesystem-path-length surprises.
Parameters
runId: string
Raw run identifier from the manifest (or directory name)
Turn an arbitrary run-id string into a short, filename-safe suffix. Keeps ASCII word/dash characters only and caps the length at 32 to avoid filesystem-path-length surprises.