11261 update gossip rules

[mehdi-aouadi]

PR Description

Update Gloas gossip rules for beta 0 spec

Fixed Issue(s)

fixes #11261

Documentation

• I thought about documentation and added the doc-change-required label to this PR if updates are required.

Changelog

• I thought about adding a changelog entry, and added one if I deemed necessary.

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Note

Medium Risk
Changes which gossip messages are accepted, ignored, or queued across EPBS paths; misalignment with the spec or lookahead logic could drop valid traffic or admit invalid messages.

Overview
Aligns Gloas gossip validation with the beta 0 spec: rule comments, ordering, and several new or tightened checks across payload attestations, execution payload bids/envelopes, and proposer preferences.

GossipValidationHelper adds isWithinProposerLookahead and isWithinParentProposerLookahead (MIN_SEED_LOOKAHEAD / clock disparity). Execution payload bids now IGNORE bids whose slot is past the parent block’s proposer lookahead, and split gas-limit vs. parent-payload checks to match the spec; fee-recipient mismatch stays IGNORE. Proposer preferences dedupe runs earlier, IGNORE pre-Gloas epochs, use the new lookahead helper, and require dependent-block state via getStateAtBlockRoot before checkpoint validation. Payload attestations REJECT out-of-range validator indices and route all outcomes through shared trace logging with validator/slot/block context.

Tests cover lookahead helpers, bid lookahead, blob limits, builder index/version, payload attestation bounds, and the updated proposer-preferences paths.

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