Add multi-tool orchestration for best-quality document conversion:
- Dual mode: Quick (fast) and Heavy (best quality, multi-tool merge)
- New convert.py - main orchestrator with tool selection matrix
- New merge_outputs.py - segment-level multi-tool output merger
- New validate_output.py - quality validation with HTML reports
- Enhanced extract_pdf_images.py - metadata (page, position, dimensions)
- PyMuPDF4LLM integration for LLM-optimized PDF conversion
- pandoc integration for DOCX/PPTX structure preservation
- Quality metrics: text/table/image retention with pass/warn/fail
- New references: heavy-mode-guide.md, tool-comparison.md
Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>
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