docs: the 2026-08-28 measurement record

[physics515]

The day's ROADMAP entries, each a measurement:

• All six runnable parity legs green byte-for-byte on the merged branch (gated The 25-spec optimization run: fused GDN middle, host packed GEMM, bounded-exact head, f16 KV, the in-situ ANOVA — and a conv boundary bug both hybrids had #42's merge).
• Same-session 27B benchmark: mummu 0.71–0.76 s/token warm vs ollama 205–212 ms/token — ~3.3×, back-to-back on one box.
• The RAYON=8 pin lifted to 16 by the re-sweep its own comment asked for (ANOVA: kernel at 96% of roofline; threads the only clear effect; end-to-end within noise, exactly as the ~1/3-host-share arithmetic predicts).
• The bounded head retired from serve by its own insitu ledger: ~92% of rows evaluated even at k=1 after the head: parallel batched bound walk + per-request k (the insitu ledger's first catch) #43 fixes — Cauchy–Schwarz bounds don't prune real head geometry. Machinery stays env-gated.
• The 512 MiB pool-dead-zone OOM fully decoded (2^29 ask vs 526,286,848 max-slice; terminal page = heap/4 = 4,210,294,784), shape-conditional, self-healing after tune; requester unnamed pending a client-side capture; RUST_BACKTRACE=1 now standing in the launcher.

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