37f79ff1b1
The upstream admin gateway tolerates only a small concurrent burst; at concurrency 4 the tail of the per-row getUserById fan-out was truncated into empty bodies on every list load (deterministic '—'), and the retries piled into the same throttle window. Measured 0 failures at concurrency 2 (and 1) versus consistent truncations at 4, so pin enrichment to 2.