document the safeTransfer self-flow branch in LibFlow.flowERC20 NatSpec

[thedavidmeister]

Summary

LibFlow.flowERC20 NatSpec only mentioned safeTransferFrom. The implementation also calls safeTransfer when from == address(this) (OZ transferFrom consumes allowance even when from == msg.sender, so the self-flow branch must use safeTransfer instead). NatSpec now states both branches and the reason for the asymmetry.

Closes #379.

Test plan

• NatSpec-only

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

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Run ID: f55e2068-fba3-4264-aded-3d9f880927ea

📥 Commits

Reviewing files that changed from the base of the PR and between ceaea3c and 6759cb6.

📒 Files selected for processing (1)

• src/lib/LibFlow.sol

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 2026-05-07-issue-379-libflow-erc20-natspec

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