CONV-132: Test PNG to JPG driver

[menvil]

Summary

• Adds failing test for PngToJpgDriver (class does not exist yet — implemented in CONV-133)
• Adds Tests\Support\ConversionContextFactory::forSourcePath() helper to build a ConversionContext without DB interaction for driver unit tests
• Test verifies: output file exists, extension = jpg, mime = image/jpeg, size > 0

Test plan

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

🤖 Generated with Claude Code

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Summary by cubic

Adds a failing unit test for PngToJpgDriver per CONV-132 and introduces Tests\Support\ConversionContextFactory::forSourcePath() to build a ConversionContext without DB access for driver tests.
The test verifies the output exists, has extension jpg, mime image/jpeg, and a size > 0.

^{Written for commit aec16b2. Summary will update on new commits.}

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