Add benchmark for ERC20 transfer via Porto with a passkey

[legion2002]

[legion2002]

@claude Create a PR for this issue, after looking at other Benchmark tests.

[github-actions]

Claude finished @legion2002's task —— View job • claude/issue-272-20250805-2250 • [Create PR ➔](https://github.com/ithacaxyz/account/compare/main...claude/issue-272-20250805-2250?quick_pull=1&title=Issue%20%23272%3A%20Changes%20from%20Claude&body=This%20PR%20addresses%20issue%20%23272%0A%0AGenerated%20with%20%5BClaude%20Code%5D(https%3A%2F%2Fclaude.ai%2Fcode)

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Creating ERC20 Transfer Benchmark via Porto with Passkey ✅

Todo List:

• Read project guidelines from CLAUDE.md
• Examine existing benchmark tests to understand patterns
• Understand Porto system and passkey integration
• Implement ERC20 transfer benchmark with passkey
• Run tests to verify implementation
• Commit and push changes
• Create pull request

Analysis:

Found existing Porto benchmarks in test/Benchmark.t.sol:

• testERC20TransferViaPortoOrchestrator() - Basic ERC20 transfer without passkey (97,030 gas)
• testERC20TransferViaPortoOrchestratorWithSpendLimits() - ERC20 transfer with passkey AND spend limits (117,083 gas)

Implementation:

✅ Added testERC20TransferViaPortoOrchestratorWithPasskey() function (116,094 gas) that:

• Uses a secp256k1 passkey for authentication
• Sets up DelegatedEOA with passkey authorization
• Configures execution permissions for ERC20 transfers
• Requires spend limits (set to type(uint256).max) for passkey operations to work
• Provides clean gas measurement for passkey-specific costs without restrictive spend limits

Key insight: The system architecture requires spend limits to be set for passkey operations, even if set to maximum values. This is likely a security design choice.

Gas Comparison:

• Porto without passkey: 97,030 gas
• Porto with passkey: 116,094 gas
• Porto with passkey + restrictive spend limits: 117,083 gas

The new benchmark isolates the passkey overhead (≈19k gas) from spend limit enforcement overhead (≈1k gas).

Pull Request Created:

🔗 PR #275: feat: add ERC20 transfer benchmark for Porto with passkey

All tests pass and the implementation follows project standards. The benchmark provides valuable insights into passkey authentication costs for the Porto system.

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