- Add FallbackState interface to track message removal attempts
- Implement getLastMessagePair() to identify last user+assistant message pair
- Add executeRevertFallback() to remove message pairs when compaction fails
- Configure max 3 revert attempts with min 2 messages requirement
- Trigger fallback after 5 compaction retries exceed
- Reset retry counter on successful message removal for fresh compaction attempt
- Clean fallback state on session deletion
Resolves: When massive context (context bomb) is loaded, compaction fails and session becomes completely broken. Now falls back to emergency message removal after all retry attempts fail, allowing session recovery.
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YeonGyu-Kim
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