Algostream_normalization.LineageLightweight transformation-chain lineage encoded as a "/"-separated path string.
Reuses the existing Event.t.source field — no schema change. The path documents the sequence of transformations a payload has been through:
Strict format (^[a-z0-9_]+(/[a-z0-9_]+)*$) and 64-char cap are enforced fail-closed.