docs(interface): declare TokenSelfTrade in IRaindexV6 and document revert in quote2/takeOrders4/clear3

[thedavidmeister]

Summary

• Declares error TokenSelfTrade() in IRaindexV6 — it was thrown by the implementation (quote2, takeOrders4, clear3 via checkTokenSelfTrade) but absent from the interface entirely, leaving callers unable to catch it by type.
• Adds a @dev revert note to quote2, takeOrders4, and clear3 documenting the self-trade guard.

No logic or bytecode change; interface/NatSpec only.

Refs rainlanguage/raindex#2671 (item 6 — undocumented TokenSelfTrade revert path in quote2)

Test plan

• CI passes (no Solidity logic change)
• Slither passes

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Review details

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Configuration used: Organization UI

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Run ID: 80ff458d-0b2f-4c5a-8551-3fedd134375a

📥 Commits

Reviewing files that changed from the base of the PR and between 3c67370 and ee79132.

📒 Files selected for processing (1)

• src/interface/IRaindexV6.sol

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 2026-06-30-issue-2671-token-self-trade-interface

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