Feature/historical sync

* feat(wallet): implement concurrent-safe NonceManager

* feat(formatters): add block formatter

* feat(providers): implement EnsResolver with caching

* feat(core): implement TransactionHelper for safe gas estimation buffers

* feat(core): add Contract class with explicit opt-in verify() bytecode check

* feat(network): implement exponential backoff retries for HTTP 429 rate limit responses

* feat(crypto): implement OpenZeppelin compatible MerkleTree

* feat(wallet): add HDWallet for BIP-39 mnemonic phrase parsing and BIP-44 key derivation with secure wiping

* feat(providers): implement RpcProvider with exponential backoff for transient RPC errors (Closes #73)

* feat(core): implement dynamic ABI loading and DynamicContract proxy

* feat(contracts): implement Yul inline assembly MathUtils library with 512-bit phantom overflow handling

* test(contracts): add Solidity / Forge test suite for Yul MathUtils

* feat(contracts): audit contracts to explicitly reject accidental plain ETH transfers and protect Vault funds

* feat(core): implement Multicall3 batching integration for view queries

* feat: add HistoricalSync for chunked log fetching

Author: EngrEOOnoja