fix(codex): use app-server native skills (#1289)

* fix(codex): use native skill catalog

* fix(codex): refresh changed skill inventory

* fix(codex): preserve skill fallback on discovery error

* fix(web): refresh skills when completion opens

cli/src/codex/codexAppServerClient.ts

@@ -9,6 +9,8 @@ import type {
     InitializeResponse,
     ModelListParams,
     ModelListResponse,
+    SkillsListParams,
+    SkillsListResponse,
     ThreadStartParams,
     ThreadStartResponse,
     ThreadResumeParams,
@@ -245,6 +247,13 @@ export class CodexAppServerClient extends JsonLineParser {
         return response as ModelListResponse;
     }
 
+    async listSkills(params: SkillsListParams): Promise<SkillsListResponse> {
+        const response = await this.sendRequest('skills/list', params, {
+            timeoutMs: 30_000
+        });
+        return response as SkillsListResponse;
+    }
+
     async listCollaborationModes(): Promise<CollaborationModeListResponse> {
         const response = await this.sendRequest('collaborationMode/list', {}, {
             timeoutMs: 30_000