CONV-224: Test cost breakdown shape

[menvil]

Summary

• Adds test that fixes stable breakdown shape: base, size, features, total, details
• Verifies breakdown total equals cost amount

Test plan

• ConversionCostEstimatorTest passes (6 tests total)

🤖 Generated with Claude Code

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Summary by cubic

Adds a unit test to lock down the cost breakdown format and ensure totals are consistent, satisfying CONV-224. The test validates the keys (base, size, features, total, details) and checks that breakdown['total'] equals the estimator’s cost amount.

^{Written for commit f9d9add. 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-224-test-cost-breakdown-shape

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