- Changed screenshot format to always use PNG instead of supporting JPEG with quality parameter.
- Changed default extract_readable format from text to markdown.
- Changed screenshot storage to use temporary directory with Snowflake IDs instead of artifacts directory.
- Changed ResizedImage interface to return buffer as Uint8Array with lazy-loaded base64 data getter for improved memory efficiency.
- Removed JPEG quality parameter from screenshot options.
- Removed ability to save screenshots to custom paths or artifacts directory.
- Added BlobStore class for content-addressed storage of large binary data externalized from session files.
- Added getBlobsDir() function to retrieve the path to the blob store directory.
- Added blob reference format (blob:sha256:<hash>) for tracking externalized image data in sessions.
- Changed image persistence to externalize images >=1KB to content-addressed blob store instead of compressing inline, reducing JSONL file size.
- Changed session loading to automatically resolve blob references back to base64 image data.
- Changed session forking to resolve blob references in copied entries to ensure data integrity.
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