Various checkpoint sync centric fixes - #661

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Subhasish-Behera wants to merge 12 commits into

grandinetech:epbs-devnet-0from

Subhasish-Behera:Subh/sync_fix

Commits on Apr 7, 2026

refactor: loc -> location
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refactor(cleanup): change block_uses_empty_full_variant naming to indicate the purpose
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feat: delay attestations with payload_present=1 until envelope (Gloas p2p rule)
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feat: prune_delayed_until_envelope
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chore: reject envelope range requests before block availability period
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fix: anchor execution_payload_state = None for checkpoint sync
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fix: handle Gloas finalized parents and genesis zero hash in is_parent_node_full_for_block
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fix: handle Gloas FULL/EMPTY blocks in checkpoint(finalization) sync
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fix: has_envelope changes
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fix(temp): make is_forward_synced preset-aware
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fix: envelope range requests for forward sync
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chore(eth2_libp2p)-OOM fix: upgrade to 50556c5b1a345a8e18bebda1e87c37fa57878468
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