**Motivation**

Mulmod, was overflowing when it shouldn't

**Description**
- Use U512 for all intermediate operations convert to U256 before
pushing into the stack, return internal error because mulmod should
always fit in U256

ethrex ab15f37 hardened the HTTP JSON-RPC defaults, gating
`admin_*`/`debug_*`/`txpool_*` behind a new `--http.api` allowlist.
Hive c4d839b3 (#1485) feature-detects the flag in `clients/ethrex/
ethrex.sh` and opts those namespaces back in. The pinned version
`1c27560a` predates that fix, so hive runs against current main start
ethrex without the namespace allowlist and any test touching the
gated namespaces gets `MethodNotFound`.

Bump to current hive HEAD (3b6bde03), which includes the fix plus a
Cargo.lock dependency-drift safeguard (#1492).

**Motivation**

Bring ethrex up to bal-devnet-7 (BAL fixtures `bal@v7.1.1`). Stacked
on top of #bal-devnet-6-pr (now in main).

**Description**

Aligns EIP-8037 state-gas accounting with bal-devnet-7 spec progression
(EELS PRs lambdaclass#2815 / lambdaclass#2816 / lambdaclass#2823 / lambdaclass#2827 / lambdaclass#2828 / lambdaclass#2836 / lambdaclass#2845 /
lambdaclass#2848),
bumps Amsterdam fixtures from `snobal-devnet-6@v1.1.0` to `bal@v7.1.1`,
and bumps the pinned hive version past the ethrex `--http.api` fix.

Main changes:

- EIP-8037 state-gas alignment with bal-devnet-7:
  - System-call state-gas reservoir.
  - Halt refunds spilled state gas (Policy A).
  - Tx-level CREATE failure refunds intrinsic `NEW_ACCOUNT`;
    `intrinsic_state_gas_charged` preserved across the failure path.
  - Tx-CREATE collision refund with regular-gas burn; billing matches
    EELS.
  - Cross-frame revert leaks inline credits.
  - Cross-frame revert reservoir formula fix.
  - Block-level `state_gas_used` subtracts `state_refund`.
- Remove same-tx SELFDESTRUCT state-gas refund (EELS PR lambdaclass#2845, v7.1.0).
- EIP-7702:
  - `set_delegation` refund via dedicated `state_refund` channel.
  - `set_delegation` refunds `AUTH_BASE` on existing delegation
    (EELS PR lambdaclass#2836).
  - `set_delegation` refunds `AUTH_BASE` on delegation clear
    (EELS PR lambdaclass#2848, v7.1.1).
- levm fixes pulled from main:
  - `revert` doesn't unmark the account as existing (lambdaclass#6592).
  - Account erroneously considered as existing after zero-value transfer
    (lambdaclass#6591).
- Tooling / tests:
  - Per-tx gas-dimension dump on block `gas_used` mismatch.
  - Bump Amsterdam fixtures to `bal@v7.1.1`.
  - Annotate BAL balance-mismatch errors with gas-equivalent diff and
    recognised state-gas constant multiples.
  - Unskip 74 bal-devnet-6 Amsterdam fixtures now passing.
  - Skip 21 stale EIP-8025 fixtures pinned at `bal@v5.7.0`
    (zkevm@v0.3.3 bundle, pre-bal-7).
  - Drop stale bal-devnet-6 known-issues entries from
    `docs/known_issues.md` and hive `KNOWN_EXCLUDED_TESTS`.
- CI:
  - Bump pinned hive version past the ethrex `--http.api` flag
    feature-detect fix (`c4d839b3`, hive lambdaclass#1485). Without this, hive
    starts ethrex with the default HTTP namespace allowlist
    (`eth,net,web3`) and tests touching `admin_*`/`debug_*`/`txpool_*`
    fail.

**Local test run**

`./run_test.sh` against `tests-bal@v7.1.1`: 2,145 / 2,145 pass.
`cargo test -p ethrex-test --tests`: 453 / 453 pass.

**Checklist**

- [ ] Updated `STORE_SCHEMA_VERSION` (crates/storage/lib.rs) if the PR
  includes breaking changes to the `Store` requiring a re-sync.

---------

Co-authored-by: Lucas Fiegl <iovoid@users.noreply.github.com>
Co-authored-by: Ivan Litteri <67517699+ilitteri@users.noreply.github.com>