Updated class diagram for IthacaAccount Merkle signature support

[Dargon789]

Reviewer's Guide

Adds Merkle tree–based signature wrapping/verification support to IthacaAccount, updates the wrapped-signature format to include a merkle flag, adjusts all test helpers and call sites accordingly, and introduces fuzz tests for Merkle signature validation while bumping the account contract version.

Updated class diagram for IthacaAccount Merkle signature support

classDiagram
    class IthacaAccount {
        +unwrapAndValidateSignature(bytes32 digest, bytes signature) bool isValid
        +unwrapAndValidateSignature(bytes32 digest, bytes signature) bytes32 keyHash
        -_verifyMerkleSig(bytes32 digest, bytes signature) bool isValid
        -_verifyMerkleSig(bytes32 digest, bytes signature) bytes32 keyHash
        +getNameAndVersion() string name
        +getNameAndVersion() string version  "0.5.11"
    }

    class MerkleProofLib {
        <<library>>
        +verifyCalldata(bytes32[] proof, bytes32 root, bytes32 leaf) bool
    }

    class LibBytes {
        <<library>>
        +loadCalldata(bytes data, uint256 offset) bytes32
        +truncatedCalldata(bytes data, uint256 newLength) bytes
    }

    class EfficientHashLib {
        <<library>>
        +sha2(bytes32 input) bytes32
    }

    class ECDSA {
        <<library>>
        +recoverCalldata(bytes32 digest, bytes signature) address
    }

    class IIthacaAccount {
        <<interface>>
    }

    class EIP712 {
    }

    class GuardedExecutor {
    }

    IthacaAccount ..|> IIthacaAccount
    IthacaAccount --|> EIP712
    IthacaAccount --|> GuardedExecutor

    IthacaAccount ..> MerkleProofLib : uses
    IthacaAccount ..> LibBytes : uses
    IthacaAccount ..> EfficientHashLib : uses
    IthacaAccount ..> ECDSA : uses

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File-Level Changes

Change	Details	Files
Introduce Merkle-based wrapped signature verification path in IthacaAccount and extend unwrapAndValidateSignature format.	Import MerkleProofLib and add internal _verifyMerkleSig that decodes (proof, root, rootSig) from calldata using assembly and verifies the digest against the Merkle root via MerkleProofLib.verifyCalldata, then validates the root with unwrapAndValidateSignature Update unwrapAndValidateSignature encoding contract comment to include an extra bool merkle flag, adjust trailer parsing to read two flag bytes (prehash and merkle), and branch to _verifyMerkleSig when the merkle flag is set before falling back to direct key-based verification	src/IthacaAccount.sol
Update wrapped signature construction in tests to include the new merkle flag byte and keep non-Merkle paths compatible.	Modify P-256, secp256k1, multi-sig, and helper intent-signature builders to append an extra uint8(0) merkle flag after the existing prehash byte Update all test scenarios that build junk or simulation signatures to include the new trailing merkle flag byte so length and parsing match the contract expectations	test/Base.t.sol test/Orchestrator.t.sol test/SimulateExecute.t.sol
Add fuzz test coverage for Merkle-based signatures and adjust EIP-712 domain decoding to ignore removed fields.	Import a Merkle implementation for testing, construct randomized Merkle trees over digests, and test valid proofs, invalid digests, tampered proofs, and tampered roots through unwrapAndValidateSignature using the new Merkle signature encoding Simplify eip712Domain destructuring in tests to only read verifyingContract, ignoring removed name/version fields now that the domain type hash is fixed	test/Account.t.sol
Bump IthacaAccount contract version string to reflect bytecode/signature format changes.	Update eip712NameAndVersion to return version 0.5.11 instead of 0.5.10	src/IthacaAccount.sol

Possibly linked issues

• Porto.sh #46: They both concern adding Merkle wrapped signature support, updating wrapped signature layout, tests, and bumping the account version.

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Originally posted by @sourcery-ai[bot] in #60 (comment)