test malformed-stack reverts in flow() and stackToFlow()

[thedavidmeister]

Summary

Pins the documented "MAY revert if malformed" / "MUST revert if malformed" clauses on IFlowV5.stackToFlow and IFlowV5.flow. The observable revert is MissingSentinel(RAIN_FLOW_SENTINEL) from LibStackSentinel.consumeSentinelTuples when any of the three required sentinels is absent.

Five tests:

• testStackToFlowRevertsOnEmptyStack
• testStackToFlowRevertsOnOneSentinelOnly
• testStackToFlowRevertsOnTwoSentinelsOnly
• testFlowRevertsOnEmptyEvaluatedStack (fuzzed)
• testFlowRevertsOnOneSentinelOnlyEvaluatedStack (fuzzed)

Closes #316 #317 #328.

Test plan

• all 5 tests pass

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 1e945ed2-cce0-4bcc-8a11-f6abb3933f2d

📥 Commits

Reviewing files that changed from the base of the PR and between ceaea3c and 3b97f37.

📒 Files selected for processing (2)

• test/src/concrete/Flow.preview.t.sol
• test/src/concrete/Flow.transfer.t.sol

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 2026-05-05-issue-316-317-328-malformed-stack-tests

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