Convert EPUB → Markdown

Convert the EPUB file at $1 to clean markdown format optimized for Claude Code context.

Steps

1. Install dependency: Use toolsmith:install-dependency skill to ensure epub-to-markdown is installed
2. Parse arguments: Input file $1 (required), output dir $2 (optional, defaults to ./.tmp/epub-converted/)
3. Convert: Run epub-to-markdown convert "$1" with --multiple-files flag (one file per chapter)
4. Report: Output location, file structure, chapter count, preview of table of contents

Goal

Extract clean, structured markdown for LLM context (analysis, summarization, Q&A) — NOT for visual rendering.

Output to .tmp/ to keep excluded from git/searches per Praxis rules.