10175 execution payload bid gloas gossip

[mehdi-aouadi]

PR Description

Add Gloas execution_payload_bid gossip rules

Fixed Issue(s)

#10175

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

Implements Gloas execution payload bid gossip validation, wires it into the node, and adds supporting helpers, constants, tests, and fixtures.

• Gloas Execution Payload Bid Gossip:
  • Add ExecutionPayloadBidGossipValidator with full bid validation (payment=0, dedupe, highest-value tracking, slot/current-next, known parent block/hash, active/unslashed builder with builder-withdrawal credential, balance checks, signature verification) using LRU/cache (SEEN_EXECUTION_PAYLOAD_BID_SET_SIZE, HIGHEST_BID_SET_SIZE).
  • Integrate into DefaultExecutionPayloadBidManager (constructor, validateAndAddBid) and wire via BeaconChainController.initExecutionPayloadBidManager.
• Helpers/Config:
  • Extend GossipValidationHelper (generic index signature check, isSlotCurrentOrNext, builder index/credential/balance checks, block-hash known, time-window tweak).
  • Expose hasBuilderWithdrawalCredential via MiscHelpersGloas.
  • Add constants in spec/config/Constants.java for bid caches.
• Test Utilities:
  • Expand DataStructureUtil bid generators (parameterized ExecutionPayloadBid/SignedExecutionPayloadBid).
• Tests:
  • New ExecutionPayloadBidGossipValidatorTest; update DefaultExecutionPayloadBidManagerTest (new ctor); refine GossipValidationHelperTest; update LocalSignerTest expected bid signature.
• Fixtures:
  • Update newBlockGLOAS.json fixtures (REST and validator) signed_execution_payload_bid fields.

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