test(lts): exercise setDefaultFee through governance flow

[thedavidmeister]

Summary

• Adds testFtsoV2LTSSetDefaultFee — a fuzz test (runs=1) that exercises setDefaultFee(uint256) on the live FeeCalculator through the governance propose→timelock→execute flow
• Validates the on-chain selector matches IGovernedFeeCalculator.setDefaultFee, and that the new default fee is reflected in calculateFeeByIds for feeds without a per-feed override

Previously setDefaultFee was declared in IGovernedFeeCalculator.sol but never called in tests; a signature drift would have gone undetected.

Closes #82

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 028c03fa-14f1-45e6-a802-0e29e944d383

📥 Commits

Reviewing files that changed from the base of the PR and between cb20d03 and 2ed3f72.

📒 Files selected for processing (1)

• test/src/lib/lts/LibFtsoV2LTS.t.sol

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch issue-82-setdefaultfee-test

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