Finish the MVP

[ly0va]

• migrate AllowedSessionsValidator.sol
• add ERC7739 signature verification
• add MSA factory
• add deploy script prototype
• add more tests
• clean up

[Copilot]

Pull Request Overview

This PR completes the MVP implementation for a modular smart account system with session-based authentication. The main purpose is to finalize core functionality including ERC7739 signature verification, factory deployment patterns, and comprehensive session validation.

• Migrate the AllowedSessionsValidator with session registry management and access control
• Add ERC7739-compliant signature verification for improved security and replay protection
• Implement MSA factory pattern with beacon proxy deployment for upgradeable accounts

Reviewed Changes

Copilot reviewed 23 out of 23 changed files in this pull request and generated 5 comments.

Show a summary per file

File	Description
test/mocks/*.sol	Mock contracts for testing targets, ERC20 tokens, ERC1271 validation, and delegate calls
test/Utils.t.sol	Utility tests for execution encoding/decoding and mode handling
test/Sessions.t.sol	Refactored session tests using new MSATest base class with improved test structure
test/MSATest.sol	Base test class providing common MSA setup and user operation utilities
test/Basic.t.sol	Comprehensive basic functionality tests including transfers, executions, and signature validation
src/utils/MSAProxy.sol	Removed legacy proxy implementation
src/modules/contrib/AllowedSessionsValidator.sol	New validator with session registry management and access control
src/modules/WebAuthnValidator.sol	Updated with proper ERC1271 support and improved validation logic
src/modules/SessionKeyValidator.sol	Enhanced with better error handling and nonce validation
src/modules/EOAKeyValidator.sol	Improved with proper event emission and error handling
src/libraries/SessionLib.sol	Enhanced session validation logic with better time range handling
src/libraries/Initializable.sol	Removed custom initializable implementation
src/interfaces/IMSA.sol	Updated interface for multi-validator initialization
src/core/ModuleManager.sol	Improved error handling and validation logic
src/core/ERC1271Handler.sol	New ERC7739-compliant signature handler
src/core/AccountBase.sol	Simplified with hardcoded EntryPoint address
src/ModularSmartAccount.sol	Major refactor integrating ERC1271Handler and OpenZeppelin Initializable
src/MSAFactory.sol	New factory for deploying beacon proxy accounts
script/Deploy.s.sol	Deployment script for the complete system
foundry.toml	Reduced optimizer runs for faster compilation

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[cpb8010]

Open questions, but otherwise looks good

[cpb8010]

Looks like lots of stuff works!