Free memory picks the load-time rung (large-v3-turbo-q8_0 default,
q5_0 under 1086 MiB free, small/small.en floor) for unpinned default
configs; thresholds derive from catalog sizes plus the protocol's
512 MiB headroom. A manual pin is never overridden, and a failed load
steps one rung down and retries exactly once before surfacing.
CUDA ranks before Vulkan only with a complete architecture-matching
toolkit (nvidia-smi GPU, nvcc, compute capability >= 7.0); otherwise
Vulkan, then CPU. The driver-only CUDA recommendation now demotes to
CPU logic instead of naming an unreachable VRAM ladder.
Refs #20
