fix: preserve workspace evidence in browser drafts

frontend/src/shell/WorkspaceEditor.tsx

@@ -108,6 +108,23 @@ function Section({ title, children }: { title: string; children: React.ReactNode
   );
 }
 
+function EvidenceSummary({ evidence }: { evidence: NonNullable<CanonicalWorkspace["evidence"]> }) {
+  const sourceIdentity = evidence.source.type === "http"
+    ? `${evidence.source.uris.length} canonical URI${evidence.source.uris.length === 1 ? "" : "s"}`
+    : evidence.source.uri;
+  return (
+    <Section title="Evidence">
+      <dl className="grid gap-2 text-sm sm:col-span-2 sm:grid-cols-2">
+        <div><dt className="font-medium text-foreground">Source type</dt><dd className="text-muted-foreground">{evidence.source.type}</dd></div>
+        <div><dt className="font-medium text-foreground">Source</dt><dd className="break-all text-muted-foreground">{sourceIdentity}</dd></div>
+        <div><dt className="font-medium text-foreground">Chunk size</dt><dd className="text-muted-foreground">{evidence.policy.max_chunk_chars.toLocaleString("en-US")} characters</dd></div>
+        <div><dt className="font-medium text-foreground">Retention</dt><dd className="text-muted-foreground">{evidence.policy.retain_published_generations.toLocaleString("en-US")} published generations</dd></div>
+      </dl>
+      <p className="sm:col-span-2 text-sm text-muted-foreground">Evidence is managed by the registry descriptor in P1.</p>
+    </Section>
+  );
+}
+
 const fieldClass = "h-9 w-full rounded-md border border-input bg-background px-2.5 text-sm shadow-xs outline-none focus-visible:ring-3 focus-visible:ring-ring/25 aria-invalid:border-destructive";
 
 export function WorkspaceEditor({ draft, onSaveDraft, onPublish, idLocked = Boolean(draft?.baseBlob) }: WorkspaceEditorProps) {
@@ -220,6 +237,8 @@ export function WorkspaceEditor({ draft, onSaveDraft, onPublish, idLocked = Bool
         </Field>
       </Section>
 
+      {workspace.evidence && <EvidenceSummary evidence={workspace.evidence} />}
+
       <Section title="Installation requirements">
         <p className="sm:col-span-2 text-sm text-muted-foreground">Hosts, users, secret-file paths, and credentials are installation bindings. They are intentionally not editable or stored in workspace drafts.</p>
       </Section>