### v2.1.7
- Fixed batch conversion and GIF processing silently producing blank (fully transparent) images when the conversion worker was interrupted by another operation — interrupted files are now automatically retried instead of being saved empty.
- Fixed small images silently producing fully transparent output in auto/batch conversion (an over-aggressive block size collapsed the pixel grid below 2px) — the block size is now clamped to a safe minimum, and blank results are rejected with an error instead of being saved.
- Fixed CLI/headless conversions keeping the process alive after finishing (the cache cleanup timer held the event loop open).
- MCP batch_convert now rejects invalid algorithm values up front instead of silently falling back to standard.
- Updated version to 2.1.7.