Add exact versioned dataframe federation - #9
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Summary\n\nAdds exact selector-aware Flat and GraphQL operations, legacy dataType compatibility, release-bound source selection, sparse-column reconciliation, project filter pushdown, federation freshness/status diagnostics, structured incompatibility errors, and row-count performance improvements.\n\n## Stack\n\nFourth tier; depends on reliability/releases.\n\n## Validation\n\nFederation acceptance tests cover recipe/version isolation, sparse project columns, cardinality conflicts, filtered cohorts, degraded reads, authorization filtering, and legacy callers.