Key Design View's parked FX-offline state to the FX's own GUID, not its slot

view_state v2 writes identities beside the v1 slot array, so a downgrade keeps
what it had. An FX gone at restore time is dropped and reported, never restored
onto whatever took its place.

src/shell/view/CLAUDE.md

@@ -34,7 +34,10 @@ decide membership or mode rules.
   value BEFORE parking; on toggle-back restore FROM the snapshot, never to a
   hardcoded "on." Round-trip (snapshot → park → restore) returns every driven flag
   to its captured value — the phase's trust anchor, the analog of the capture null
-  test.
+  test. Per-FX offline is snapshotted WITH each FX's identity (`TrackFX_GetFXGUID`)
+  and restored through `core/view/fx_offline`, so a chain reordered while the track
+  was parked cannot land one plugin's state on another; an FX gone at restore time
+  is dropped and reported to the console, never restored onto its old slot.
 - **GUID-keyed, reorder-safe.** Membership/snapshot keys on track GUID
   (`GetTrackGUID`), never track index; tolerates unknown/stale GUIDs (pruned on
   reconcile).