use forge-std boundPrivateKey for fuzzed keys

[thedavidmeister]

Summary

forge-std's StdUtils (already inherited via Test → FlowTest) exposes boundPrivateKey(uint256) — the canonical helper for clamping a fuzzed value into the secp256k1 valid private-key range. Five manual occurrences of (key % (SECP256K1_ORDER - 1)) + 1 and their identical "// Ensure the fuzzed key is within the valid range for secp256k1" comments are replaced.

Closes #420.

Test plan

• full suite — 31/31

🤖 Generated with Claude Code

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ℹ️ Review info

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Configuration used: Organization UI

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Plan: Pro

Run ID: 35516357-9e97-4e11-a76b-79a803108945

📥 Commits

Reviewing files that changed from the base of the PR and between ceaea3c and e5313b6.

📒 Files selected for processing (2)

• test/src/concrete/Flow.expression.t.sol
• test/src/concrete/Flow.signedContext.t.sol

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 2026-05-07-issue-420-bound-private-key

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