spread.sh: the engine path is absolute

Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>

runs/spread.sh

@@ -7,7 +7,7 @@ run=${1:?usage: spread.sh runs/<run> [seeds...]}; shift
 seeds=${*:-1 2 3}
 IRIS=/var/local/cargo-target/release/iris
 T=/var/local/cargo-target/release/portal-trainer
-LLM="MODEL=qwen3:8b $(dirname "$0")/../engines/ollama.sh"
+LLM="MODEL=qwen3:8b $(cd "$(dirname "$0")/.." && pwd)/engines/ollama.sh"
 cd "$run"
 for mode in full skim; do
   skim=""; [ "$mode" = skim ] && skim="--skim"