Crate exo_dag_db_graph 

Graph and layered organization for DAG DB.

Facade removal is complete; this crate owns memory graph invariants, layered placement, hygiene, and layer policy code. Downstream compatibility uses explicit bridges such as exo_api::dagdb.

Modules

layer_creation_policy

Pure PRD09 graph-governed layer creation policy.

layered_graph

Deterministic layered graph contracts for graph-of-graphs memory.

layered_hygiene

Pure PRD04 layer hygiene scoring and planning contracts.

layered_placement

Pure layer placement contracts for additive layered graph routing.