Add Flashbots MEV bundle submission support (#32)

* Add Flashbots MEV bundle submission support (#13)

Implement Flashbots relay client with eth_sendBundle, mev_sendBundle,
eth_callBundle, and eth_cancelBundle. Includes EIP-191 auth signing
(X-Flashbots-Signature header) and Bundle convenience builder.

* Fix review findings: thread allocator through JSON parsers, add ownership docs

Use caller's allocator instead of page_allocator in response parsing
functions for consistent memory tracking. Add doc comments clarifying
Bundle's borrowing semantics for transaction slices.

* Bump version to 0.3.0 for Flashbots bundle support release

* Fix CallBundleOpts stateBlockNumber to accept tags, parse decimal strings

- Change state_block_number from ?u64 to ?BlockParam so callers can pass
  block tags like "latest" per the Flashbots spec
- Add decimal string parsing for bundleGasPrice/coinbaseDiff/etc fields
  which Flashbots returns as decimal strings, not hex

* Escape JSON strings in params builders, fix decimal u256 overflow check

- Add appendJsonEscaped helper for RFC 8259 string escaping (quotes,
  backslashes, control chars) and use it for replacement_uuid,
  privacy.hints, and privacy.builders
- Fix parseDecimalU256 to use pre-multiply overflow bounds check
  (maxInt(u256)/10) instead of post-wrap comparison

GLV secp256k1 + lane-complementing Keccak: beat Voltaire on all crypt…

…o benchmarks (#22)

* GLV secp256k1 + lane-complementing Keccak: beat Voltaire on all crypto benchmarks

* Update alloy.rs benchmark results with GLV + lane-complementing Keccak numbers

* Revert inline unroll and @vector theta: runtime loop is faster on Apple Silicon

* Apply zig fmt to keccak_optimized.zig

* Clean up chiLane dead code and add derivePublicKey scalar validation

Remove unused cx parameter and need_complement dead code from chiLane
(XKCP correctness comes from full round interaction, not per-lane invariant).
Add explicit scalar validation to derivePublicKey matching sign().
Fix sweep test comment (0 to 299, not 300).

Bump version to 0.2.2

Optimize performance: beat alloy.rs on 18/24 benchmarks (#3)

* Optimize performance: beat alloy.rs on 18/24 benchmarks

Major performance optimizations across the entire eth-zig library to
compete with alloy.rs. Previously alloy won 14/24 benchmarks; now
eth-zig wins 18/24 with only 5 alloy wins remaining (secp256k1 EC
curve limitation and u256 LLVM multiplication overhead).

Key optimizations:
- Replace GeneralPurposeAllocator with c_allocator in benchmarks
- Remove redundant verifyRecovery from secp256k1 sign() (5 EC muls -> 1)
- Add zero-overhead direct buffer RLP encoding (writeDirect API)
- Add zero-overhead direct buffer ABI encoding (writeValuesDirect)
- Pre-calculate RLP/ABI/TX sizes to enable single-allocation encoding
- Eliminate all temp ArrayList buffers in RLP, ABI, and TX serialization
- Add u256 fastDiv with u128 fast-path (67ns -> 6ns)
- Add comptime hex decode lookup table (36ns -> 16ns)
- Optimize bytesToUint with BSWAP instead of byte loop (12ns -> 6ns)
- Use @clz for branchless byte-length counting in RLP encoding
- Fix address_derivation benchmark to match alloy's scope
- Add alloy.rs comparison benchmark suite and compare.sh script

* Add benchmark comparison results table

Documents the full eth-zig vs alloy.rs benchmark comparison with
before/after numbers, score summary, and analysis of remaining gaps.

* Fix zig fmt formatting in rlp.zig

Add integration tests, README overhaul, and bug fixes (#2)

* Add integration tests, overhaul README, fix provider/wallet bugs

Integration tests (tests/integration_tests.zig):
- 15 Anvil-backed tests covering chain state, account state, gas,
  blocks, wallet transactions, and receipt verification
- Graceful skip when Anvil is not running

README overhaul:
- Add "Why eth.zig?" section with key differentiators
- Add ERC-20 Quick Start example
- Fix HD wallet example to use actual API
- Add examples directory table
- Add feature comparison vs Zabi
- Update module and feature tables with new modules

Bug fixes in provider.zig:
- Fix use-after-free in extractResultString (was returning slice
  into freed JSON parser memory)
- Fix Zig 0.15 optional coercion in parseOptionalHash/parseOptionalHexU64

Bug fix in wallet.zig:
- Fix std.time.sleep -> std.Thread.sleep for Zig 0.15

* Add benchmark suite, CONTRIBUTING, CHANGELOG, and issue templates

- bench/bench.zig: 11 benchmarks (keccak, secp256k1, ABI encode/decode,
  RLP, tx serialization, HD wallet, EIP-712, address checksum)
- build.zig: add `zig build bench` step (always ReleaseFast)
- CONTRIBUTING.md: build/test/PR guidelines + architecture diagram
- CHANGELOG.md: full v0.1.0 feature list
- .github/ISSUE_TEMPLATE: bug report + feature request templates

Initial release: pure Zig Ethereum client library v0.1.0

Complete implementation of core Ethereum primitives, ABI/RLP encoding,
ECDSA signing, transaction types (legacy through EIP-4844), BIP-32/39/44
HD wallets, HTTP+WebSocket JSON-RPC transports, ENS resolution,
contract interaction, Multicall3, EIP-712, and multi-chain support.
Zero external dependencies. 446 passing tests.