Artifacts with no ArtifactContentStored mapping (older sessions, or stages where the
slot->hash link was lost) showed a blank pane. listArtifacts now falls back to the
stage's last InferenceCompleted output so the operator can still see what the stage
produced. Empty-string content is normalised to null so the viewer shows a clear
'(no content stored)' instead of a blank pane.
Verified: role_pipeline sessions already resolve content from CAS (index + segments
intact, store rooted at ~/.config/correx/artifacts); the previously-blank sessions are
healthcheck/degenerate runs whose inference output was genuinely empty.
kami
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