# docs
### Responsibility Table
| `entities.md` | Cross-entity index of all doc entities and doc instances |
| `doc_graph.yml` | Machine-readable cross-reference graph of doc instances |
| `feature/` | Feature doc entity — user-facing capability navigation hubs |
| `api/` | API doc entity — public programmatic interface contracts |
| `invariant/` | Invariant doc entity — correctness properties and guarantees |
| `algorithm/` | Algorithm doc entity — internal algorithmic design |