Remove podcast checklist backend, calendar events and reminder emails; v2.14.3

Co-Authored-By: Claude Sonnet 5.5 <noreply@anthropic.com>

server/state.js

@@ -3,7 +3,6 @@ import {
   EMPTY_VISITOR_STATS,
   DEFAULT_PUBLISH_STATE,
   DEFAULT_REPLY_TEMPLATES,
-  buildDefaultPodcastChecklist,
 } from './config.js'
 
 export const state = {
@@ -36,8 +35,6 @@ export const state = {
   replyHistory: [],
   replyHistoryWritePromise: Promise.resolve(),
 
-  podcastChecklist: buildDefaultPodcastChecklist(),
-  podcastChecklistWritePromise: Promise.resolve(),
 
   studyUsers: [],
   studyUsersWritePromise: Promise.resolve(),
@@ -100,8 +97,6 @@ export const state = {
   newsletterIssues: [],
   newsletterIssuesWritePromise: Promise.resolve(),
 
-  calendarEvents: [],
-  calendarEventsWritePromise: Promise.resolve(),
 
   auditLog: [],
   auditLogWritePromise: Promise.resolve(),