Add support for fulu fork epoch and bpo schedule (#15975)

* wip

* fixing tests

* adding script to update workspace for eth clients

* updating test sepc to 1.6.0 and fixing broadcaster test

* fix specrefs

* more ethspecify fixes

* still trying to fix ethspecify

* fixing attestation tests

* fixing sha for consensus specs

* removing script for now until i have something more standard

* fixing more p2p tests

* fixing discovery tests

* attempting to fix discovery test flakeyness

* attempting to fix port binding issue

* more attempts to fix flakey tests

* Revert "more attempts to fix flakey tests"

This reverts commit 25e8183703.

* Revert "attempting to fix port binding issue"

This reverts commit 583df8000d.

* Revert "attempting to fix discovery test flakeyness"

This reverts commit 3c76525870.

* Revert "fixing discovery tests"

This reverts commit 8c701bf3b9.

* Revert "fixing more p2p tests"

This reverts commit 140d5db203.

* Revert "fixing attestation tests"

This reverts commit 26ded244cb.

* fixing attestation tests

* fixing more p2p tests

* fixing discovery tests

* attempting to fix discovery test flakeyness

* attempting to fix port binding issue

* more attempts to fix flakey tests

* changelog

* fixing import

* adding some missing dependencies, but  TestService_BroadcastAttestationWithDiscoveryAttempts is still failing

* attempting to fix test

* reverting test as it migrated to other pr

* reverting test

* fixing test from merge

* Fix `TestService_BroadcastAttestationWithDiscoveryAttempts`.

* Fix again `TestService_Start_OnlyStartsOnce`.

* fixing TestListenForNewNodes

* removing manual set of fulu epoch

* missed a few

* fixing subnet test

* Update beacon-chain/rpc/eth/config/handlers_test.go

Co-authored-by: Preston Van Loon <pvanloon@offchainlabs.com>

* removing a few more missed spots of reverting fulu epoch setting

* updating test name based on feedback

* fixing rest apis, they actually need the setting of the epoch due to the guard

---------

Co-authored-by: Manu NALEPA <enalepa@offchainlabs.com>
Co-authored-by: Preston Van Loon <pvanloon@offchainlabs.com>

config/params/fork_test.go

@@ -130,10 +130,10 @@ func TestNextForkData(t *testing.T) {
 			wantedEpoch:       cfg.BellatrixForkEpoch,
 		},
 		{
-			name:              "after last bpo - should be far future epoch and 0x00000000",
+			name:              "post last full fork, fulu bpo 1",
 			currEpoch:         params.LastForkEpoch() + 1,
-			wantedForkVersion: [4]byte(cfg.ElectraForkVersion),
-			wantedEpoch:       cfg.ElectraForkEpoch,
+			wantedForkVersion: [4]byte(cfg.FuluForkVersion),
+			wantedEpoch:       cfg.BlobSchedule[0].Epoch,
 		},
 	}
 	for _, tt := range tests {

config/params/mainnet_config.go

@@ -30,7 +30,7 @@ const (
 	// Electra Fork Epoch for mainnet config
 	mainnetElectraForkEpoch = 364032 // May 7, 2025, 10:05:11 UTC
 	// Fulu Fork Epoch for mainnet config
-	mainnetFuluForkEpoch = math.MaxUint64 // Far future / to be defined
+	mainnetFuluForkEpoch = 411392 // December 3, 2025, 09:49:11pm UTC
 )
 
 var mainnetNetworkConfig = &NetworkConfig{
@@ -338,7 +338,16 @@ var mainnetBeaconConfig = &BeaconChainConfig{
 	SubnetsPerNode:                  2,
 	NodeIdBits:                      256,
 
-	BlobSchedule: []BlobScheduleEntry{},
+	BlobSchedule: []BlobScheduleEntry{
+		{
+			Epoch:            412672, // December 9, 2025, 02:21:11pm UTC
+			MaxBlobsPerBlock: 15,
+		},
+		{
+			Epoch:            419072, // January 7, 2026, 01:01:11am UTC
+			MaxBlobsPerBlock: 21,
+		},
+	},
 }
 
 // MainnetTestConfig provides a version of the mainnet config that has a different name