results: M1 Max + c4-standard-4 on bumped SHA combo

First clean runs after the leanSig c08a3bae + leanMultisig 44635cabde
bump. The local M1 Max ran on this developer machine; the
c4-standard-4 on us-central1-a (only one of the 5 remote VMs that
got past GCP's stockout in us-central1-{a,b,c,e1-b,w1-a} this round).

Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>

Author: unnawut