Convert PPTX → Markdown

Convert the PowerPoint file at $1 to clean markdown format optimized for LLM context.

Steps

1. Install dependency: Use toolsmith:install-dependency skill to ensure markitdown is installed
2. Parse arguments: Input file $1 (required), output dir $2 (optional, defaults to ./converted/)
3. Prepare output dir: Create $2 if it doesn't exist
4. Convert:

   source .venv/bin/activate && python -m markitdown "$1" -o "$OUTPUT_DIR/output.md"
   

5. Report: Output location, file sizes, structure summary (slide count, headings, tables, images), any warnings

Goal

Extract clean markdown for LLM context — analysis, summarization, Q&A. NOT for round-tripping back to PPTX.