Normalise manifest.files into a flat list of runRelPath strings.
De-duplicates while preserving first-seen order so callers downstream
(the aggregator's availableSet, materialiseManifestFiles, etc.)
never observe the same path twice when a manifest section accidentally
lists it under two top-level keys.
Normalise
manifest.filesinto a flat list ofrunRelPathstrings.De-duplicates while preserving first-seen order so callers downstream (the aggregator's
availableSet,materialiseManifestFiles, etc.) never observe the same path twice when a manifest section accidentally lists it under two top-level keys.