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In Gloas, beacon blocks are imported into fork choice immediately - the payload envelope and data columns arrive separately. KZG commitments moved from the column sidecar into the execution payload bid, so the existing `DataAvailabilityChecker` (which assumes block and data are coupled) can't be used for Gloas. * Introduced `PendingPayloadCache` to keep track of payload and data columns per block root. * Added gossip column verification * Added support for Gloas data column reconstruction * Payload envelope verification simplified: removed `MaybeAvailableEnvelope`, `ExecutedEnvelope`, `EnvelopeImportData` Not yet implemented (tracked with TODOs): - Proper lookup sync for Gloas columns arriving before blocks - Partial column merging for Gloas - Moving `load_gloas_payload_bid` disk reads off the async runtime - Backfill/range sync for Gloas Based on @eserilev's PR and work in progress. See also #9202 for verification. Co-Authored-By: Eitan Seri-Levi <eserilev@ucsc.edu> Co-Authored-By: Eitan Seri- Levi <eserilev@gmail.com> Co-Authored-By: Daniel Knopik <daniel@dknopik.de> Co-Authored-By: Daniel Knopik <107140945+dknopik@users.noreply.github.com> Co-Authored-By: dapplion <35266934+dapplion@users.noreply.github.com> Co-Authored-By: Jimmy Chen <jchen.tc@gmail.com>