CONV-141: Test PNG to PDF driver

[menvil]

Summary

• Adds failing test for PngToPdfDriver (implemented in CONV-142)
• Verifies: file exists, extension=pdf, mime=application/pdf, size>0, starts with %PDF header

Test plan

• Test fails with "Target class does not exist" before implementation (expected)
• composer lint passes

🤖 Generated with Claude Code

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Summary by cubic

Adds a feature test that defines the expected PNG-to-PDF conversion behavior for PngToPdfDriver (CONV-141). It checks the output file exists, has a .pdf extension, mime type application/pdf, non-zero size, and starts with a %PDF header.

^{Written for commit 4f8220c. Summary will update on new commits.}

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• Commit unit tests in branch feature/CONV-141-test-png-to-pdf-driver

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