refactor: remove legacy workspace UI state

frontend/src/shell/WorkspaceManager.tsx

@@ -64,11 +64,10 @@ export function WorkspaceManager({ open, onClose }: { open: boolean; onClose: ()
   const workspaces = workspacesQuery.data ?? [];
   const selectedSummary = useMemo(() => workspaces.find((workspace) => workspace.id === selectedId), [selectedId, workspaces]);
   const selectedSummaryIncomplete = Boolean(selectedSummary && !selectedSummary.revision);
-  const selectedIsLegacy = selectedSummary?.revision?.state === "migration_required";
   const detailQuery = useQuery({
     queryKey: ["workspace", selectedId],
     queryFn: () => getWorkspace(selectedId!),
-    enabled: Boolean(open && selectedId && !localDraft && !selectedSummaryIncomplete && !selectedIsLegacy),
+    enabled: Boolean(open && selectedId && !localDraft && !selectedSummaryIncomplete),
   });
   const status = statusQuery.data;
   const record = detailQuery.data;
@@ -317,13 +316,8 @@ export function WorkspaceManager({ open, onClose }: { open: boolean; onClose: ()
                 <p className="font-semibold">Workspace summary unavailable</p>
                 <p className="mt-1">This workspace summary is incomplete. Refresh the registry or choose another workspace before creating sessions or editing drafts.</p>
               </div>
-            ) : selectedIsLegacy ? (
-              <div className="rounded-md border border-amber-500/30 bg-amber-500/10 px-4 py-3 text-sm">
-                <p className="font-semibold">Migration required</p>
-                <p className="mt-1">This workspace uses a legacy descriptor and must be migrated to schema v3 before new sessions or publication.</p>
-              </div>
             ) : detailQuery.isError && selectedId && !localDraft ? <QueryError name="Workspace details failed" message="Could not load workspace details." retryLabel="Retry workspace details" onRetry={() => { void detailQuery.refetch(); }} /> : !currentDraft && !detailQuery.isLoading && <div className="grid min-h-64 place-items-center text-center"><div><h3 className="font-heading font-semibold">Select a workspace</h3><p className="mt-1 text-sm text-muted-foreground">Review an existing definition or start a browser-only draft.</p></div></div>}
-            {!selectedSummaryIncomplete && !selectedIsLegacy && !detailQuery.isError && (currentDraft || detailQuery.isLoading) && (
+            {!selectedSummaryIncomplete && !detailQuery.isError && (currentDraft || detailQuery.isLoading) && (
               <>
                 {detailQuery.isLoading && !currentDraft ? <p className="text-sm text-muted-foreground">Loading workspace definition…</p> : currentDraft && <>
                   <div className="mb-5 flex flex-wrap items-start justify-between gap-3 border-b border-border/70 pb-4">
@@ -347,7 +341,7 @@ export function WorkspaceManager({ open, onClose }: { open: boolean; onClose: ()
                   <section className="mt-6 border-t border-border/70 pt-5" aria-label="Git status and history">
                     <h3 className="font-heading text-sm font-semibold">Git status &amp; history</h3>
                     <p className="mt-2 text-sm text-muted-foreground">{status?.degraded ? "Using the last valid local snapshot." : "Registry checkout is current."}</p>
-                    {record && <p className="mt-1 font-mono text-xs text-muted-foreground">Revision {record.revision.commit.slice(0, 12)} · {record.revision.state}</p>}
+                    {record && <p className="mt-1 font-mono text-xs text-muted-foreground">Revision {record.revision.commit.slice(0, 12)}</p>}
                   </section>
                 </>}
               </>