Built clean from 8aa1fbb. Staged roll partition 2 -> 1 -> 0 with a quorum-write
probe between each (201 every time); sts 3/3 updated=3, and all three voters report
build_hash=8aa1fbb4140ac720b360465073388fe5ad0f84a7 with no -dirty suffix.
Post-deploy, measured live: a non-unit query (|q|^2 = 132.4) now returns distances
of 1.7944-1.8059, inside the documented [0,4] and identical on all three replicas;
the same class of query returned 591-1174 before. A zero-norm query returns 400.
Per-group vector counts are now visible for all three shard groups (groups 1 and 2
had no series at all before) and read spread 0.
59d7dadc18