Add portal dashboard IA task and refresh Velocity validation notes

OPEN_THREADS.md

@@ -47,10 +47,9 @@ Completed:
 - crash observability and classification
 
 ### Fabric Readiness Gating
-Status: startup rehydrate path fixed in plugin and happy-path validated live.
+Status: startup rehydrate path fixed in plugin and both happy-path and negative-path startup validation passed.
 
 Still outstanding:
-- negative-path validation: verify a `ready=false` backend is skipped on Velocity startup rehydrate
 - confirm whether any remaining agent-side registration path can surface a backend before readiness probe success
 - see `SCRATCH/session-stabilization-fabric-findings.md`
 
@@ -128,6 +127,7 @@ Outstanding:
 - SSH config snippet for power users
 - user onboarding flow
 - email notifications
+- dashboard information architecture refresh — remove or rethink duplicate resource overview/cards that do not add value beyond the dedicated servers page
 - remove `testdaemon` binary from repo root
 
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