test UnsupportedFlowInputs revert in flowInit

[thedavidmeister]

Summary

Pins the flowInit guard that rejects any non-zero flowInputs byte returned by the deployer.

Flow.sol:210 reverts with UnsupportedFlowInputs when flowInputs != 0. No prior test exercised this branch; the only mock IO strings used in tests had flowInputs == 0, so a regression here would not have been caught.

The new fuzz test mocks the deployer to return a non-zero flowInputs byte and asserts the revert selector. Mutation verified: inverting the check (!= 0 → == 0) makes the test fail; reverting passes.

Closes #310 #320.

Test plan

• testFlowConstructionRevertsOnNonZeroFlowInputs — 100 fuzz runs, all pass
• mutation: invert the check in Flow.sol:210 → test fails
• static via rainix-sol-static

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 05c9441a-398f-4424-8126-4b2031ee56ed

📥 Commits

Reviewing files that changed from the base of the PR and between ceaea3c and 4c23090.

📒 Files selected for processing (1)

• test/src/concrete/Flow.construction.t.sol

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 2026-05-04-issue-310-320-unsupported-flow-inputs-test

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