feat: the compaction divider leads with why T3 Code compacted

"Context automatically compacted before cache expiry 252K → 18.3K tokens"
and "Context compacted after being idle …" replace the trailing note.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
2caffffcfbJulius Marminge committed on 10/24/2026, 5:49:49 AMparentf5d4576

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