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/channels/discord.ts

@@ -184,11 +184,14 @@ export class DiscordChannel implements Channel {
     botToken: string,
     opts: DiscordChannelOpts,
     agentTypeFilter?: AgentType,
+    channelName?: string,
   ) {
     this.botToken = botToken;
     this.opts = opts;
     this.agentTypeFilter = agentTypeFilter;
-    if (agentTypeFilter) {
+    if (channelName) {
+      this.name = channelName;
+    } else if (agentTypeFilter) {
       this.name = `discord-${agentTypeFilter}`;
     }
   }
@@ -723,21 +726,20 @@ registerChannel('discord', (opts: ChannelOpts) => {
     token,
     opts,
     hasCodexBot ? 'claude-code' : undefined,
+    'discord',
   );
 });
 
 // Register the secondary Codex bot channel.
-// In unified mode all bots register unconditionally; in legacy per-service mode
-// the codex service uses its own DISCORD_BOT_TOKEN via systemd EnvironmentFile override.
 registerChannel('discord-codex', (opts: ChannelOpts) => {
   const token = getEnv('DISCORD_CODEX_BOT_TOKEN') || '';
-  if (!token) return null; // Codex Discord bot is optional
-  return new DiscordChannel(token, opts, 'codex');
+  if (!token) return null;
+  return new DiscordChannel(token, opts, 'codex', 'discord-codex');
 });
 
 // Register the review bot channel (codex agent type, separate token).
 registerChannel('discord-review', (opts: ChannelOpts) => {
   const token = getEnv('DISCORD_REVIEW_BOT_TOKEN') || '';
-  if (!token) return null; // Review Discord bot is optional
-  return new DiscordChannel(token, opts, 'codex');
+  if (!token) return null;
+  return new DiscordChannel(token, opts, 'codex', 'discord-review');
 });