docs: add image optimization pipeline plan

Detailed implementation plan for automatic image optimization:
- Lossless WebP storage in SQLite (26-41% smaller than PNG)
- AVIF/WebP/JPEG responsive variants generated to disk cache
- Oban for durable async processing with SQLite
- 10-phase incremental implementation with checkpoints
- Comprehensive test coverage strategy

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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Jamey Greenwood 2026-01-21 21:56:30 +00:00
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