feat: auto-recreate reviewer containers on token rotation

When OAuth tokens rotate or refresh, all reviewer containers are
automatically removed. The next reviewer turn recreates them with
the latest token, preventing 401 auth failures.

Uses callback pattern to avoid circular dependencies:
- token-rotation.ts: onTokenRotated(cb)
- token-refresh.ts: onTokenRefreshed(cb)
- index.ts: registers recreateAllReviewerContainers as callback

src/message-runtime.ts

@@ -442,8 +442,7 @@ export function createMessageRuntime(deps: MessageRuntimeDeps): {
     if (isReviewerHandoff) {
       const revChName =
         REVIEWER_AGENT_TYPE === 'claude-code' ? 'discord' : 'discord-review';
-      handoffChannel =
-        findChannelByName(deps.channels, revChName) || channel;
+      handoffChannel = findChannelByName(deps.channels, revChName) || channel;
     }
 
     const runId = `handoff-${handoff.id}`;