fix(client): work through the findings from the coverage pass

214 items came out of writing the tests. Real defects are corrected, dead code
is removed rather than covered, and the tests that pinned the old behaviour
move with them.

Also drops two agent coverage scratch files that slipped into the coverage PR
and adds the ignore rule that keeps them out.

server/src/nest/plugins/registry/registry.service.ts

@@ -118,6 +118,11 @@ export interface ManifestPreview {
   icon: string | null;
   requiredAddons: string[];
   pluginDependencies: PluginDependency[];
+  /**
+   * The UI-facing slice of `capabilities`. A plugin that replaces planner tabs hides core
+   * UI, so the reviewer has to see it BEFORE installing, not only on the installed row.
+   */
+  capabilities: { widget?: { slot?: string }; tripPage?: { replaces?: string[] } };
 }
 
 let _cache: { data: Registry; expiresAt: number } | null = null;
@@ -749,6 +754,20 @@ function previewManifest(raw: unknown): ManifestPreview {
         }))
         .filter((d) => d.id && d.version)
     : [];
+  const rawCaps = (m.capabilities && typeof m.capabilities === 'object' ? m.capabilities : {}) as Record<
+    string,
+    unknown
+  >;
+  const widget = (rawCaps.widget && typeof rawCaps.widget === 'object' ? rawCaps.widget : null) as {
+    slot?: unknown;
+  } | null;
+  const tripPage = (rawCaps.tripPage && typeof rawCaps.tripPage === 'object' ? rawCaps.tripPage : null) as {
+    replaces?: unknown;
+  } | null;
+  const capabilities: ManifestPreview['capabilities'] = {};
+  if (widget) capabilities.widget = typeof widget.slot === 'string' ? { slot: widget.slot } : {};
+  if (tripPage) capabilities.tripPage = { replaces: strings(tripPage.replaces) };
+
   return {
     permissions: strings(m.permissions),
     egress: strings(m.egress),
@@ -758,6 +777,7 @@ function previewManifest(raw: unknown): ManifestPreview {
     icon: typeof m.icon === 'string' ? m.icon : null,
     requiredAddons: strings(m.requiredAddons),
     pluginDependencies,
+    capabilities,
   };
 }