Unpinned rules die when the summarizer drops their turn (38% violation if dropped, 0% if they survive). The fix is not a better summary — pin named constraints in the system prompt so they never traverse the lossy path. Constraint survival is this lab, not a second tab.

turns 1..N (compactable) "rule" turn compact summary (lossy) rule dropped → 38% system prompt (never compacted) "rule" pinned compact (turns only) "rule" survives held → 0% same compaction event — the only variable is which side of the boundary the rule sat on