087c4f4f4e
The per-process address-space cap was defense-in-depth on top of the SessionDB leak sweep (nobody sets the knob; the sweep removes the leak). On the 96-worker CI runner it was also the only PR-specific difference when tests/tools/test_image_source.py hung to the 600s SIGKILL while the same file passes in ~30s on every sibling branch: RLIMIT_AS counts virtual reservations, and image/threading libraries reserve far more address space than they touch. Keep the sweep, remove the cap and its env knob.