Adds a 7-file English-language manual targeted at new human contributors:
index, overview, statuses & transitions (with mermaid state diagrams),
git workflow, MCP integration, docker, and troubleshooting. The manual
is the *map* — it cross-references existing runbooks/ADRs/architecture
docs rather than duplicating their content.
Regenerates docs/INDEX.md and validates with check-doc-links.mjs.
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
