CONV-226: Test unsupported cost estimation is rejected

[menvil]

Summary

• Adds test that unknown conversion pairs throw UnsupportedConversionCostException
• Adds FakeUnsupportedConverter helper for testing unsupported pairs

Test plan

• ConversionCostEstimatorTest passes (7 tests total)

🤖 Generated with Claude Code

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Summary by cubic

Adds a unit test to ensure unsupported conversion pairs are rejected by the cost estimator, throwing UnsupportedConversionCostException (CONV-226). Introduces a FakeUnsupportedConverter helper to simulate unsupported pairs.

^{Written for commit f877c5b. Summary will update on new commits.}

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch feature/CONV-226-test-unsupported-cost-estimation-is-rejected

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