CONV-233: Test failed conversion does not spend credits

[menvil]

Summary

• Adds test verifying failed conversions do not spend credits and charge status becomes failed
• Uses FakeConverterDriver with shouldFail: true to trigger failure path

Test plan

• ProcessConversionJobCreditTest passes (2 tests total)

🤖 Generated with Claude Code

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Summary by cubic

Add a feature test to ensure failed conversions do not spend credits and set the credit charge to Failed with a captured_amount of 0. Uses a failing FakeConverterDriver and runs ProcessConversionJob end-to-end, addressing CONV-233.

^{Written for commit 9f0ffc3. 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-233-test-failed-conversion-does-not-spend-credits

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