feat: collect accountability root evidence

docs/financial-fabric-operator-guide.md

@@ -50,6 +50,12 @@ fabric/discovery/railiance-accountability-roots.yaml
 
 The manifest schema is documented in `docs/accountability-root-manifest.md`.
 
+To collect raw evidence from those roots without promoting graph state:
+
+```bash
+railiance-fabric discover-roots --max-items-per-root 200
+```
+
 The financial export must satisfy these invariants:
 
 - every accepted node has resolvable ownership;