CONV-146: Add real driver integration smoke tests

[menvil]

Summary

• Adds ProcessConversionJobRealDriverTest with 3 end-to-end smoke tests through the full queue pipeline
• Covers PNG→JPG, JPG→WEBP, and PNG→PDF with real drivers (no FakeConverterDriver)
• Each test verifies: job status = Completed, result_file_id is set, physical file exists in storage
• PNG→PDF test additionally checks %PDF header
• Tests use Storage::fake('local') + ImageFixture to generate source images programmatically

Test plan

• All 3 smoke tests pass with real drivers
• composer test passes (268 tests)
• composer lint passes
• npm run build passes

🤖 Generated with Claude Code

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Summary by cubic

Implements CONV-146 by adding end-to-end smoke tests for the conversion queue using real drivers to verify it produces stored result files. Covers PNG→JPG, JPG→WEBP, and PNG→PDF, asserting Completed status, result_file_id, file presence in local storage, and a %PDF header for PDFs.

^{Written for commit 6897c92. 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-146-add-real-driver-integration-smoke-tests

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