feat(consultation): unify server-distributed agents without fixed roles

src/lib/coding-teacher.ts

@@ -1,6 +1,5 @@
 import { hostApiFetch, createHostEventSource, ensureHostApiToken } from './host-api';
 import type {
-  ConsultationRole,
   TeacherAvailability,
   TeacherCheckInInput,
   TeacherCheckInResult,
@@ -11,11 +10,14 @@ import type {
   TeacherTopic,
   TeacherTopicList,
 } from '../../shared/coding-teacher';
-export function teacherTopicsPath(projectId: string, sourceId: string, role?: ConsultationRole) {
-  if (role && projectId !== 'preview') return `/api/coding/projects/${encodeURIComponent(projectId)}/${role}-topics`;
+export function teacherTopicsPath(projectId: string) {
   return projectId === 'preview'
     ? '/api/coding/teacher-preview/topics'
-    : `/api/coding/projects/${encodeURIComponent(projectId)}/conversations/${encodeURIComponent(sourceId)}/teacher-topics`;
+    : `/api/coding/projects/${encodeURIComponent(projectId)}/agent-topics`;
+}
+/** Read old locally-generated friend histories without copying or rebinding them. */
+export function legacyTopicBase(base: string, legacyFriend: boolean) {
+  return legacyFriend ? base.replace(/agent-topics$/, 'friend-topics') : base;
 }
 export const teacherApi = {
   catalog: () => hostApiFetch<TeacherCatalog>('/api/coding/teacher/teachers'),
@@ -24,9 +26,9 @@ export const teacherApi = {
       method: 'POST',
       body: JSON.stringify(input),
     }),
-  config: (role: ConsultationRole = 'teacher') =>
+  config: () =>
     hostApiFetch<TeacherAvailability & { definition: TeacherDefinition | null }>(
-      `/api/coding/${role}/config`
+      '/api/coding/teacher/config'
     ),
   preview: (draftRevision: number) =>
     hostApiFetch<{ payload: TeacherDefinition; draft_revision: number }>(