[fix.fep.λ.D8+] make the benchmark network visually representative

Replace the three-node review fixture with a connected eight-ligand T4L planning network because the repository hero must demonstrate the actual network-review instrument rather than a separate pose-review surface. Keep the cached snapshot fail-closed and label its local identity explicitly so it cannot be mistaken for a durable OpenFE result. Browser acceptance at 1600x1000 confirmed 8 nodes, 13 edges, zero overlap, full graph containment, plan-only status and execution disabled.

Author: ivanicu

README.md

@@ -53,9 +53,9 @@ being developed.
 
 ![Motif Workbench FEP network review and governed execution workspace](docs/screenshots/06_motif_fep_workspace.png)
 
-*A free-energy campaign workspace: ligand-network review, atom-mapping evidence, exact
-prepared-system selection and durable execution controls remain visible in one frame. A
-network plan is labelled as a plan, never as an FEP result.*
+*An eight-ligand T4 lysozyme FEP planning workspace: the complete transformation network,
+atom-mapping evidence, exact prepared-system selection and durable execution controls remain
+visible in one frame. The cached benchmark is labelled as a plan, never as an FEP result.*
 
 | Stage | What the frontend makes inspectable |
 |---|---|