test(registry): assert getFtsoV2LTS and getFeeCalculator return non-zero

[thedavidmeister]

Summary

• Adds testGetFtsoV2LTS() — asserts the registry lookup returns a non-zero address
• Adds testGetFeeCalculator() — asserts the registry lookup returns a non-zero address
• Imports FtsoV2Interface and IFeeCalculator for the return types

Previously only getFtsoRegistry had an assertion; a misconfigured registry name for FtsoV2 or FeeCalculator would silently propagate a zero address to all downstream callers.

Closes #85

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: ASSERTIVE

Plan: Pro

Run ID: 4c75a5e6-a616-4f83-884a-a61a372d3e5b

📥 Commits

Reviewing files that changed from the base of the PR and between cb20d03 and 2fa35be.

📒 Files selected for processing (1)

• test/src/lib/registry/LibFlareContractRegistry.t.sol

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch issue-85-registry-address-assertions

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