increase max l2 message size to 6.25MB

[magicxyyz]

DO NOT MERGE

[github-actions]

❌ 3 Tests Failed:

Tests completed	Failed	Passed	Skipped
2170	3	2167	0

View the top 3 failed tests by shortest run time

TestVersion30

Stack Traces | 6.940s run time

... [CONTENT TRUNCATED: Keeping last 20 lines]
�[90mTime to activate hostio-test: 211.920656ms�[0;0m
ERROR[01-29|18:10:04.636] Dangling trie nodes after full cleanup
    precompile_inclusion_test.go:90: goroutine 455446 [running]:
        runtime/debug.Stack()
        	/opt/hostedtoolcache/go/1.25.6/x64/src/runtime/debug/stack.go:26 +0x5e
        github.com/offchainlabs/nitro/util/testhelpers.RequireImpl({0x40c3290, 0xc09c9dba40}, {0x4080c00, 0xc13bbb3530}, {0x0, 0x0, 0x0})
        	/home/runner/work/nitro/nitro/util/testhelpers/testhelpers.go:29 +0x55
        github.com/offchainlabs/nitro/system_tests.Require(0xc09c9dba40, {0x4080c00, 0xc13bbb3530}, {0x0, 0x0, 0x0})
        	/home/runner/work/nitro/nitro/system_tests/common_test.go:1790 +0x5d
        github.com/offchainlabs/nitro/system_tests.testPrecompiles(0xc09c9dba40, 0x1e, {0xc08fe1ddb0, 0x6, 0x48e1d4?})
        	/home/runner/work/nitro/nitro/system_tests/precompile_inclusion_test.go:90 +0x371
        github.com/offchainlabs/nitro/system_tests.TestVersion30(0xc09c9dba40?)
        	/home/runner/work/nitro/nitro/system_tests/precompile_inclusion_test.go:67 +0x798
        testing.tRunner(0xc09c9dba40, 0x3d094e8)
        	/opt/hostedtoolcache/go/1.25.6/x64/src/testing/testing.go:1934 +0xea
        created by testing.(*T).Run in goroutine 1
        	/opt/hostedtoolcache/go/1.25.6/x64/src/testing/testing.go:1997 +0x465
        
    precompile_inclusion_test.go:90: �[31;1m [] execution aborted (timeout = 5s) �[0;0m
--- FAIL: TestVersion30 (6.94s)

TestBatchPosterActuallyPostsBlobsToL1

Stack Traces | 26.730s run time

=== RUN   TestBatchPosterActuallyPostsBlobsToL1
=== PAUSE TestBatchPosterActuallyPostsBlobsToL1
=== CONT  TestBatchPosterActuallyPostsBlobsToL1
    batch_poster_test.go:884: goroutine 53 [running]:
        runtime/debug.Stack()
        	/opt/hostedtoolcache/go/1.25.6/x64/src/runtime/debug/stack.go:26 +0x5e
        github.com/offchainlabs/nitro/util/testhelpers.RequireImpl({0x40c3290, 0xc000503500}, {0x4080720, 0x5e96fe0}, {0x0, 0x0, 0x0})
        	/home/runner/work/nitro/nitro/util/testhelpers/testhelpers.go:29 +0x55
        github.com/offchainlabs/nitro/system_tests.Require(0xc000503500, {0x4080720, 0x5e96fe0}, {0x0, 0x0, 0x0})
        	/home/runner/work/nitro/nitro/system_tests/common_test.go:1790 +0x5d
        github.com/offchainlabs/nitro/system_tests.TestBatchPosterActuallyPostsBlobsToL1(0xc000503500)
        	/home/runner/work/nitro/nitro/system_tests/batch_poster_test.go:884 +0x388
        testing.tRunner(0xc000503500, 0x3d08420)
        	/opt/hostedtoolcache/go/1.25.6/x64/src/testing/testing.go:1934 +0xea
        created by testing.(*T).Run in goroutine 1
        	/opt/hostedtoolcache/go/1.25.6/x64/src/testing/testing.go:1997 +0x465
        
    batch_poster_test.go:884: �[31;1m [] context deadline exceeded �[0;0m
--- FAIL: TestBatchPosterActuallyPostsBlobsToL1 (26.73s)

TestBatchPosterActuallyPostsBlobsToL1

Stack Traces | 29.070s run time

... [CONTENT TRUNCATED: Keeping last 20 lines]
DEBUG[01-29|18:04:02.451] Pushed sync data from consensus to execution synced=true  maxMessageCount=8   updatedAt=2026-01-29T18:04:02+0000 hasProgressMap=false
DEBUG[01-29|18:04:02.451] Pushed sync data from consensus to execution synced=true  maxMessageCount=4   updatedAt=2026-01-29T18:04:02+0000 hasProgressMap=false
DEBUG[01-29|18:04:02.451] Finality not supported, not pushing finality data to execution
DEBUG[01-29|18:04:02.451] Finality not supported, not pushing finality data to execution
DEBUG[01-29|18:04:02.451] Pushed sync data from consensus to execution synced=true  maxMessageCount=9   updatedAt=2026-01-29T18:04:02+0000 hasProgressMap=false
DEBUG[01-29|18:04:02.451] Pushed sync data from consensus to execution synced=true  maxMessageCount=2   updatedAt=2026-01-29T18:04:02+0000 hasProgressMap=false
DEBUG[01-29|18:04:02.451] Pushed finality data from consensus to execution safeMsgCount=8 finalizedMsgCount=1 validatedMsgCount=0
DEBUG[01-29|18:04:02.451] Finality not supported, not pushing finality data to execution
DEBUG[01-29|18:04:02.451] Finality not supported, not pushing finality data to execution
DEBUG[01-29|18:04:02.451] Pushed sync data from consensus to execution synced=true  maxMessageCount=2   updatedAt=2026-01-29T18:04:02+0000 hasProgressMap=false
TRACE[01-29|18:04:02.451] Handled RPC response                     reqid=2403 duration="4.028µs"
INFO [01-29|18:04:02.453] InboxTracker                             sequencerBatchCount=9   messageCount=9   l1Block=41  l1Timestamp=2026-01-29T18:04:01+0000
DEBUG[01-29|18:04:02.454] Reinjecting stale transactions           count=0
DEBUG[01-29|18:04:02.455] Served eth_getBlockByNumber              reqid=1898 duration="142.276µs"
TRACE[01-29|18:04:02.463] got new header from L1                   number=60  hash=f4abde..b01fb6                   header="&{ParentHash:0x3771cd53ab534afd92075a0888513536f8e3b0cb9276783315259a5b36bb6345 UncleHash:0x1dcc4de8dec75d7aab85b567b6ccd41ad312451b948a7413f0a142fd40d49347 Coinbase:0x0000000000000000000000000000000000000000 Root:0x402d87fc1e09da55cefba373a9c3cada64a20a2d37f1e0ec44bf03d84abceac3 TxHash:0xf0f099d9ecb81a8905b241fd3fdcb1f4407b35bbb5ff766fcfb6f6ee3fa07620 ReceiptHash:0xf78dfb743fbd92ade140711c8bbc542b5e307f0ab7984eff35d751969fe57efa Bloom:[0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0] Difficulty:+0 Number:+60 GasLimit:15904622 GasUsed:21000 Time:1769709877 Extra:[216 131 1 16 4 132 103 101 116 104 136 103 111 49 46 50 53 46 54 133 108 105 110 117 120] MixDigest:0x470b623cba02d83496976c7689427b9aeaa8101e6ed6b71629956280345a49e1 Nonce:[0 0 0 0 0 0 0 0] BaseFee:+59746582 WithdrawalsHash:0x56e81f171bcc55a6ff8345e692c0f86e5b48e01b996cadc001622fb5e363b421 BlobGasUsed:0xc0923bd140 ExcessBlobGas:0xc0923bd148 ParentBeaconRoot:0x0000000000000000000000000000000000000000000000000000000000000000 RequestsHash:0xe3b0c44298fc1c149afbf4c8996fb92427ae41e4649b934ca495991b7852b855}"
INFO [01-29|18:04:02.463] Imported new potential chain segment     number=80  hash=4372fe..8b005a                   blocks=1   txs=1   mgas=0.021  elapsed=16.682ms       mgasps=1.259    triediffs=351.31KiB  triedirty=0.00B
INFO [01-29|18:04:02.451] InboxTracker                             sequencerBatchCount=9   messageCount=9   l1Block=41  l1Timestamp=2026-01-29T18:04:01+0000
DEBUG[01-29|18:04:02.463] Created new diff layer                   id=29                 block=28  nodesize=4.38KiB  statesize=2.08KiB
TRACE[01-29|18:04:02.463] Handled RPC response                     reqid=284  duration="2.275µs"
--- FAIL: TestBatchPosterActuallyPostsBlobsToL1 (29.07s)

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