Two-tier compaction and the circuit breaker

Ablation lab: a fail-closed deep compaction that keeps failing triggers a token-burning spiral (panic retries every 15 steps, rolling compression stuck at 0.90). Split compaction into a cheap rolling tier (every 25 steps, always allowed) and an expensive deep tier (every 100 steps) guarded by a three-state circuit breaker (CLOSED -> OPEN after 2 consecutive failures -> HALF-OPEN probe after 30-step cooldown) with safe-mode archive re-grounding. Home: breaker on vs off ablation table (run length, compaction tokens, premises retained).

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