Init Paper Book

Scaffold a runnable, browsable companion to a LaTeX paper. The book lives in the vault, atlas renders it, and direct URLs at books.user.com/<slug>/<chapter> make it shareable. There is no separate build pipeline — atlas is the renderer.

For syncing an existing book to a paper revision, use /audit-paper-book instead.

Hard rules

Existential — block writing

1. No new claims. The book may rephrase, scaffold, and explain, but never introduce results not in the paper. Numbers and theorems trace to the paper.
2. Numeric invariant. Every numeric claim in the book must match the paper. Mismatches block.
3. Paper is canonical. Source-of-truth is the paper PDF/tex. Edits to the book do not edit the paper. Edits to the paper require /audit-paper-book to propagate.
4. Atlas slug match. Book slug = atlas topic filename (lowercase, hyphenated). If project dir and atlas filename disagree, stop and prompt — alignment is required at the source, not a workaround in the book.

Format — catch in review

5. Vault location. Book chapters live at ~/Research-Vault/books/<slug>/. Never in the project tree (atlas runs under launchd and File Provider paths hang).
6. Registry entry. ~/Research-Vault/books/index.yaml must list the slug, title, atlas-topic pointer, bibliography file, and explicit chapter order.