Preserve pricing and accounting dimensions through the ledger

[iam-brain]

Question

Extend the shadow pipeline in one isolated PR so admitted observations preserve model attribution, input, cached input, output, pricing status, and daily-row data needed by existing reports without weakening the lineage fingerprint contract.

[iam-brain]

Implemented and locally validated in stacked fork PR #27. Per the map completion rule, this slice does not wait for CI or merge.