- Output files now go to output/<document-name>/ relative to input
- Images named after nearest heading (e.g., file_flow.svg)
- Multiple images under same heading get suffixes: _1, _2, etc.
- Images before any heading use document name as prefix
- Add StateT-based AST traversal for heading tracking
- Add HSpec test suite with 21 tests
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Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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