perf(kona): reduce reset walk proof reads

[fakedev9999]

Summary

Optimizes kona's proof reset path without reverting the v1.6.0 initial_reset correctness fix.

This PR has three pieces:

• l2_block_info_by_number reads the L2 header plus the transaction-0 Merkle path needed to decode L1BlockInfoTx, instead of hydrating the full transaction trie.
• system_config_by_number uses the same header-plus-tx0 path before calling the existing to_system_config logic.
• DerivationPipeline::initial_reset still computes the walked-back reset point, but uses L2BlockInfo.seq_num to skip same-L1-origin L2 blocks. Blocks with the same L1 origin have the same channel-timeout stop predicate, so this preserves the walked-back reset semantics while avoiding per-L2-block tx0 reads.

It deliberately does not restore the old precomputed reset shortcut: 31703ba851 documents that using safe-head system config can diverge from op-node when the batcher address changes inside the channel-timeout window.

Measurement

op-succinct validation range: Katana 36207424~36207429 (6 blocks, tx counts 1,1,1,1,1,1).

side	total preimages	total bytes	pipeline-construction bytes
base before op-succinct PR ethereum-optimism#928	27,674	18,479,023	0
kona v1.6.0 head	30,946	20,120,288	1,651,074
first fork patch (17af43b1)	30,406	19,243,741	774,527
final fork patch (654eb009)	27,934	18,558,882	89,668

Final patch removes 1,561,406 witness preimage bytes, or 95.13% of the measured head-vs-base byte regression on this range. Remaining delta vs pre-ethereum-optimism#928 base is +79,859 bytes (+0.43%).

Safety

• Preserves DerivationPipeline::initial_reset and walked-back system config semantics.
• Does not trust host-supplied reset origin/config.
• Keeps tx0 membership tied to the transactions root via the Merkle path.
• Uses existing L1BlockInfoTx decoding and to_system_config logic.
• Adds/keeps unit coverage for tx0-only proof reads, tx0-only system config reads, and sequence-number same-origin reset skipping.

Verification

• cargo +1.94.0 test --manifest-path rust/kona/crates/protocol/derive/Cargo.toml initial_reset -- --nocapture
• cargo +1.94.0 check --manifest-path rust/kona/crates/proof/proof/Cargo.toml --lib
• cargo +1.94.0 test --manifest-path rust/kona/crates/proof/proof/Cargo.toml --features alloy-eips/kzg,rand/thread_rng l2_block_info_by_number_reads_only_first_transaction_path -- --nocapture
• cargo +1.94.0 test --manifest-path rust/kona/crates/proof/proof/Cargo.toml --features alloy-eips/kzg,rand/thread_rng system_config_by_number_reads_only_first_transaction_path -- --nocapture
• op-succinct host witness measurement with fakedev9999/optimism@654eb009 pinned on Katana range 36207424~36207429