Brummel
832c325e9d
Records the bench numbers (rc/bump 2.5–2.9x on the Implicit-mode fixtures, missing Decision 10's 1.3x retirement target) and the two paths forward — lower the threshold (Path A, pragmatic; rc and gc are within 5% of each other so retirement under "RC ≤ Boehm ± 5%" qualifies) vs build a slab/pool allocator first (Path B, larger iter, closes most of the gap to bump). The 1.3x criterion was orchestrator-level commitment in Decision 10 and not meeting it is a prompt for an orchestrator- level discussion, not for the implementer to autonomously flip the default. 18f deliberately stops without flipping default, without dropping -lgc, without marking Decision 9 historical.