Enhance image optimization in pull request workflow

[pernielsentikaer]

Added image optimization tools and processing logic for PNG and JPEG images in the workflow.

Processing: guru-1.png
2053787 bytes (35.38% smaller): guru-1.png
✓ guru-1.png was: 3178097B now: 2053787B saving: 1124310B (35.37%)
Processing: guru-2.png
1972703 bytes (33.41% smaller): guru-2.png
✓ guru-2.png was: 2962524B now: 1972703B saving: 989821B (33.41%)
Processing: guru-3.png
2036690 bytes (35.56% smaller): guru-3.png
✓ guru-3.png was: 3160690B now: 2036690B saving: 1124000B (35.56%)
✓ TOTAL was: 9301311B now: 6063180B saving: 3238131B (34.81%)

Should be ~13x faster without any drop in the quality (size is the same)

[greptile-apps]

Greptile Summary

This PR modernizes the image optimization workflow by replacing the imageoptim-cli toolchain with oxipng and jpegoptim. The new implementation processes PNG and JPEG images individually with detailed size tracking and reporting, eliminating the batching approach and removing the need for npm dependencies.

• Replaced brew install imageoptim + npm install imageoptim-cli with brew install oxipng jpegoptim
• Removed batch processing logic (30 images per batch) in favor of individual file processing
• Added comprehensive size tracking with before/after statistics and percentage savings
• Implemented proper error handling for stat command cross-platform compatibility (-f%z for macOS, -c%s for Linux)
• Added formatted output using numfmt to display human-readable file sizes
• Maintained existing workflow integration with images_optimized flag for commit message generation

Confidence Score: 5/5

• This PR is safe to merge with no risks - it's a well-implemented optimization improvement
• The implementation is solid with proper cross-platform handling, good error handling (division by zero checks, stat fallbacks), and maintains all existing workflow integration points. The switch from imageoptim-cli to native tools eliminates npm dependencies and improves performance significantly (13x faster per PR description)
• No files require special attention

Important Files Changed

Filename	Overview
.github/workflows/pull_request_merge.yml	Replaced imageoptim-cli with oxipng and jpegoptim for faster, more efficient image optimization with detailed reporting

[greptile-apps]

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[0xdhrv]

This looks good to me. Tested with couple of images and it works as expected.

[grzegorzkrukowski]

Hey

Thanks for improving that one ! Looks fine for me.

Only thing I would improve here is to not double the logs for each file.
Each tool is printing the stats for each file already, so doing a custom calculations seems a bit unnecessary.