document.exportSelection (the MCP export tool's `selection: true`) now
replies with `format` and the encoder's `warnings`, the same list a
whole-document export gives: lossy WebP written lossless, blend modes left
out of SVG Tiny 1.2, PDF layers at 1.4 and the rest. A selection export
that approximates nothing replies with an empty list.
Root cause: export_selection encoded with `encode`, which drops the
warnings encode_with_warnings returns, and its reply carried only path,
bytes and bounds. The params doc and docs/mcp.md now describe the reply.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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