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Fresh CODEGRAPH_RESOLVE_PROFILE tables at 2c and 8c on the round-2 build: the 8c settle stage is 3.6s — the double-buffer absorbs the entire resolveOne population, superseding §7a.2's core-invariant framing. The 8c cost is writes-under-readers: main-thread deletes+insertEdges run ~3× slower (+102s) with 4 readonly workers attached — mechanism unproven, named as the next probe. Two same-day experiments killed by measurement and reverted: budget-scaled name caches (v1 LRU regressed via delete+set-per-get churn + GC; v2 mutation-free second-chance cache landed exactly on baseline — the 11µs exact-match is per-ref floor, not refetch overhead) and lazy candidates JSON (read stage flat). New 2c record 16.5min clean-host; 8c range 15.0–16.4min across n=2 — ranges, never single runs. Round-2 deferral cuts did move 8c parse (202.6→178.5s). Levers re-ranked: writes-under-readers probe > cFnPtr native site extraction (~230s of synthesis) > backpressure byte volume > recreate. Co-authored-by: Claude Fable 5 <noreply@anthropic.com>