feat: paired review system overhaul — unified service, configurable agents, silent output removal

- Remove UNIFIED_MODE legacy: single service manages all 3 Discord bots
- Add OWNER_AGENT_TYPE / REVIEWER_AGENT_TYPE env vars for configurable agent selection
- Fix Discord channel routing: reviewer output goes through correct bot (discord/discord-review)
- Fix channel name assignment: explicit names prevent agentTypeFilter collision
- Remove silent output suppression system: harness-level protections replace prompt workarounds
- Add reviewer approval detection: DONE marker on first line stops ping-pong
- Include user's original message in reviewer prompt for context
- Fix round_trip_count auto-reset on new user message
- Fix session ID conflict: reviewer doesn't reuse owner's session
- Fix pending progress text flush in runner on close sentinel
- Promote buffered intermediate text to final result when result event has no text
- Remove legacy files: .env.codex.example, .env.codex-review.example, migrate-unify.cjs
- Update CLAUDE.md: server-side build deployment, unified architecture docs

src/service-routing.ts

@@ -2,9 +2,10 @@ import {
   CLAUDE_SERVICE_ID,
   CODEX_MAIN_SERVICE_ID,
   CODEX_REVIEW_SERVICE_ID,
+  OWNER_AGENT_TYPE,
+  REVIEWER_SERVICE_ID_FOR_TYPE,
   SERVICE_AGENT_TYPE,
   SERVICE_ID,
-  UNIFIED_MODE,
   normalizeServiceId,
 } from './config.js';
 import {
@@ -51,10 +52,13 @@ function getDefaultLease(chatJid: string): EffectiveChannelLease {
   const hasCodex = types.includes('codex');
 
   if (hasClaude && hasCodex) {
+    // Owner/reviewer service IDs derived from OWNER_AGENT_TYPE / REVIEWER_AGENT_TYPE env vars
+    const ownerServiceId =
+      OWNER_AGENT_TYPE === 'codex' ? CODEX_MAIN_SERVICE_ID : CLAUDE_SERVICE_ID;
     return {
       chat_jid: chatJid,
-      owner_service_id: CLAUDE_SERVICE_ID,
-      reviewer_service_id: CODEX_MAIN_SERVICE_ID,
+      owner_service_id: ownerServiceId,
+      reviewer_service_id: REVIEWER_SERVICE_ID_FOR_TYPE,
       activated_at: null,
       reason: null,
       explicit: false,
@@ -140,16 +144,10 @@ export function isReviewerServiceForChat(
 }
 
 export function shouldServiceProcessChat(
-  chatJid: string,
-  serviceId: string = SERVICE_ID,
+  _chatJid: string,
+  _serviceId: string = SERVICE_ID,
 ): boolean {
-  if (UNIFIED_MODE) return true;
-  const normalizedServiceId = normalizeServiceId(serviceId);
-  const lease = getEffectiveChannelLease(chatJid);
-  return (
-    normalizedServiceId === lease.owner_service_id ||
-    normalizedServiceId === lease.reviewer_service_id
-  );
+  return true;
 }
 
 export function activateCodexFailover(chatJid: string, reason: string): void {