Update benchmark documentation after harness replacement

docs/LLM/ciru-activefpx-promptforge.md

@@ -253,7 +253,7 @@ ngram draft costs its own forward pass / occupancy without adding enough
 accepted tokens on top of MTP. Baseline (no ngram) remains the production
 config (`--spec-type draft-mtp` only). Keep ngram-mod off.
 
-The harness lives at [scripts/bench-spec-stack.sh](../../scripts/bench-spec-stack.sh);
+The historical harness was moved to `.AGENTTRASH/bench-scripts-20260901/` and is retained for audit only.
 it boots the v3 stack on a scratch port and reads authoritative
 `print_timing` lines. It requires the production service to be stopped.