4d87290d39
Unpinned zero-credential installs now pick Exa or Parallel by the parity of the per-process random session id (stable within a process, even split fleet-wide) instead of always favoring Parallel. An explicit hermes tools selection (web.backend / per-capability keys) bypasses the split entirely; the runner-up vendor stays in the walk as fallback. Live E2E: 6 fresh processes split 3/3 between vendors, each performed a real keyless search via its picked endpoint; explicit pin verified.