Note

Implements the fork choice on_execution_payload path using a new Gloas payload executor, extends import results and logging/debug utilities, and adapts APIs to use Optional headers.

• Fork Choice:
  • Implement onExecutionPayload to retrieve state by slot+block_root, process/verify payload, run DA check (NOOP for now), execute via ForkChoicePayloadExecutorGloas, and commit to store.
  • Add importExecutionPayloadAndState flow and invalid execution payload reporting.
  • Add ForkChoiceUtil.applyExecutionPayloadToStore (no-op; Gloas override placeholder).
• Execution Payload Processing (Gloas/Bellatrix):
  • Create ForkChoicePayloadExecutorGloas to submit engine_newPayload and track results.
  • Update OptimisticExecutionPayloadExecutor.optimisticallyExecute to accept Optional<ExecutionPayloadHeader> and update all callers (Bellatrix, Gloas, forkchoice executor/tests).
  • Gloas processor now passes Optional.empty() and validates envelope as before.
• Data Structures & Results:
  • Add getSlot() and getSlotAndBlockRoot() to SignedExecutionPayloadEnvelope.
  • Expand ExecutionPayloadImportResult with new failure reasons (UNKNOWN_BEACON_BLOCK_ROOT, FAILED_EXECUTION, DA failures) and factory helpers.
  • AvailabilityChecker tweaks: constants and javadoc updated to Optional method signature.
• Debugging & Logging:
  • DebugDataDumper/DebugDataFileDumper: support saving invalid execution payloads; refine data column sidecar saving.
  • P2PLogger: add onInvalidExecutionPayload.
• Tests:
  • Add ForkChoicePayloadExecutorGloasTest and update existing tests for Optional header API and file dumper behavior.

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