fix(skills): drive UI rename gating from server renamable flag

Expose authoritative renamable on skill list responses using the same
managed-root policy as renameSkill, drop the divergent UI path heuristic,
and remove an unused rejection-test fixture.

Co-authored-by: Serhii Dziupin <makeittech@users.noreply.github.com>

packages/ui/src/components/sections/skills/SkillsSidebar.tsx

@@ -27,7 +27,6 @@ import { SidebarGroup } from '@/components/sections/shared/SidebarGroup';
 import { Icon } from "@/components/icon/Icon";
 import { useI18n } from '@/lib/i18n';
 import { SETTINGS_PANEL_TITLE_CLASS } from '@/components/sections/shared/SettingsSection';
-import { isManagedSkillFilesystemPath } from '@/components/sections/skills/skillLocations';
 
 interface SkillsSidebarProps {
   onItemSelect?: () => void;
@@ -37,7 +36,7 @@ const BUILT_IN_SKILL_LOCATION = '<built-in>';
 
 const isBuiltInSkill = (skill: DiscoveredSkill | null | undefined): boolean => skill?.path === BUILT_IN_SKILL_LOCATION;
 const isRenamableSkill = (skill: DiscoveredSkill | null | undefined): boolean => (
-  !!skill && !isBuiltInSkill(skill) && isManagedSkillFilesystemPath(skill.path)
+  !!skill && !isBuiltInSkill(skill) && skill.renamable === true
 );
 
 export const SkillsSidebar: React.FC<SkillsSidebarProps> = ({ onItemSelect }) => {

packages/ui/src/components/sections/skills/skillLocations.ts

@@ -57,22 +57,3 @@ export function locationPartsFrom(value: SkillLocationValue): { scope: SkillScop
   }
   return { scope: match.scope, source: match.source };
 }
-
-/** True when a discovered skill path is under a managed skill root that rename/delete may mutate. */
-export function isManagedSkillFilesystemPath(skillPath: string | null | undefined): boolean {
-  if (!skillPath || skillPath === '<built-in>') return false;
-  const normalized = skillPath.replace(/\\/g, '/');
-  if (
-    normalized.includes('/.cache/opencode/skills/')
-    || normalized.includes('/Caches/opencode/skills/')
-    || normalized.includes('/Library/Caches/opencode/skills/')
-  ) {
-    return false;
-  }
-  return (
-    /\/\.opencode\/skills?\//.test(normalized)
-    || /\/\.claude\/skills\//.test(normalized)
-    || /\/\.agents\/skills\//.test(normalized)
-    || /\/\.config\/opencode\/skills?\//.test(normalized)
-  );
-}

packages/ui/src/stores/useSkillsStore.ts

@@ -70,6 +70,8 @@ export interface DiscoveredSkill {
   description?: string;
   /** Domain folder parsed from file path, e.g. "automation-ai", "lark-ecosystem" */
   group?: string;
+  /** Authoritative server flag: skill lives under a managed root and can be renamed in place. */
+  renamable?: boolean;
 }
 
 /** Parse the domain group folder from a skill file path.
@@ -93,6 +95,7 @@ interface RawSkillResponse {
   path: string;
   scope?: SkillScope;
   source?: SkillSource;
+  renamable?: boolean;
   sources?: {
     md?: {
       description?: string;
@@ -237,6 +240,7 @@ export const useSkillsStore = create<SkillsStore>()(
                   source: s.source ?? 'opencode',
                   description: s.sources?.md?.description || '',
                   group: parseSkillGroup(s.path),
+                  renamable: s.renamable === true,
                 }));
 
                 set({ skills: configSkills, isLoading: false });