Replaces the earlier subtree docs with submodule clone/pull/push flow
and notes where local-only files live.
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
Add root CLAUDE.md documenting the multi-project layout, subtree workflow,
and cross-project invariants shared between manga-dl (scraper) and
manga-site (Next.js reader).
Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
