The usual pattern waits until context nears the limit, then does one large blocking compaction that summarizes a huge span at once. Instead, shave a little already-consumed history every single turn so the running total stays flat, always preserving a guaranteed tail of recent user messages. The summarizer cost is amortized across turns rather than paid as one stall, and per-model thresholds tune how hard each backend gets trimmed.
Micro-Compact Every Turn Instead of One Big Blocking Pause
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