fix IFlowV5 rainlang example to include three sentinels

[thedavidmeister]

Summary

The IFlowV5 rainlang example showed only one sentinel as a stack item. A valid flow stack requires three sentinels (one terminator per token-type group): LibFlow.stackToFlow calls consumeSentinelTuples three times.

Following the previous example produced an invalid stack — consumeSentinelTuples for erc721 and erc20 would pull from below the intended boundary rather than terminating cleanly.

The fix mirrors test/lib/LibStackGeneration.sol::generateFlowStack:

• bottom: erc1155 terminator sentinel + erc1155 tuples
• middle: erc721 terminator sentinel + erc721 tuples
• top: erc20 terminator sentinel + erc20 tuples

Closes #424.

Test plan

• NatSpec-only

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

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Run ID: 6f8fd391-ce5b-47e0-a1a1-653987e58c52

📥 Commits

Reviewing files that changed from the base of the PR and between ceaea3c and b5496bd.

📒 Files selected for processing (1)

• src/interface/IFlowV5.sol

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 2026-05-07-issue-424-iflowv5-rainlang-example

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