Auto-compact enters infinite retry loop after timeout, consuming rate limit

Description

When leaving a Claude Code session open overnight (macOS sleep), the auto-compact agent enters a retry loop that doesn't stop.

Observed behavior

• 27 agent-acompact-* subagent files created over ~2.5 hours
• 4,246 API requests from compact agents alone
• ~695 million cache-read tokens consumed
• Exhausted the 5-hour "Current Session" rate limit without any user interaction

Timeline

00:28 - 1 compact attempt (machine briefly woke?)
       - 10h gap (sleep)
10:14 - Machine wakes, compact loop starts
10:14-12:37 - 27 new compact agents spawned (~1 every 5-8 min)
12:37 - Loop ended (rate limit hit or manual intervention)

Expected behavior

• Auto-compact should have a max retry limit
• Should not retry indefinitely after timeout
• Should detect rate limit and back off gracefully

Environment

• Claude Code version: 2.1.29
• Model: claude-opus-4-5-20251101
• OS: macOS (Darwin 25.2.0)
• Subscription: Claude Max

Steps to reproduce

1. Start a Claude Code session with a large context (near 200k limit)
2. Leave session open overnight with machine going to sleep
3. Wake machine in the morning
4. Observe multiple agent-acompact-* files being created in ~/.claude/projects/<project>/<session-id>/subagents/

Additional context

The compact agent seems to timeout after ~10 minutes and then immediately retry, creating a new subagent each time. There appears to be no exit condition or maximum retry count.