test reentrancy guard on store + ERC721/ERC1155 recipient paths

[thedavidmeister]

Summary

Flow.flow carries nonReentrant and the LibFlow.flow NatSpec names four reentrancy entry points. PR #446 covers ERC20/ERC777-style reentrancy via a malicious token. This adds tests for the remaining three:

1. Malicious interpreter store: MaliciousReenteringStore.set re-enters flow.flow. Etched at the framework's STORE address. Storage slots from the deployed contract are copied across so the etched code retains its evaluable.
2. Malicious ERC721 recipient: MaliciousReenteringRecipient.onERC721Received re-enters. The framework's TOKEN_B is etched with StubERC721WithReceiverHook so the underlying safeTransferFrom call propagates into the recipient hook (the standard mock token does not call the hook).
3. Malicious ERC1155 recipient: same shape via StubERC1155WithReceiverHook at TOKEN_C and onERC1155Received.

Mutation verified: dropping nonReentrant from Flow.flow makes all three new tests fail; reverting passes.

Replaces the closed PR #440 (NatSpec-only enumeration). Closes #309.

Test plan

• all 3 tests pass under current code
• mutation: drop nonReentrant → all 3 fail

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 341eaa03-67af-4225-96ef-83985b370bf3

📥 Commits

Reviewing files that changed from the base of the PR and between ceaea3c and 470fe7b.

📒 Files selected for processing (5)

• test/concrete/MaliciousReenteringRecipient.sol
• test/concrete/MaliciousReenteringStore.sol
• test/concrete/StubERC1155WithReceiverHook.sol
• test/concrete/StubERC721WithReceiverHook.sol
• test/src/concrete/Flow.transfer.t.sol

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 2026-05-07-issue-309-reentrancy-per-path-tests

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