test: data column sidecar gossip validation spec tests - #9430

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ChainSafe:nflaig/deneb-gossip-spec-testsfrom

lodekeeper:feat/data-column-sidecar-gossip-spec-harness

Commits on May 30, 2026

feat(test): wire gossip_data_column_sidecar into spec test harness
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2f877d3
feat(beacon-node): validate finalized-ancestor and seen-tuple for data column sidecars
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3435d9b

Commits on Jun 2, 2026

fix(beacon-node): check seen data columns before validation
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589caee

Commits on Sep 9, 2026

Merge 'nflaig/deneb-gossip-spec-tests' (2188545c) to refresh #9430

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claude
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