docs: add task-type accuracy benchmark (router vs keyword heuristic)

- bench/tasks.jsonl (37 natural-language prompts, 7 task types) + bench/accuracy.py
- measured on the live allaigate router: 100% (37/37) vs keyword heuristic 32%
- BENCHMARKS.md accuracy section; README (EN+RU) perf+accuracy tables and test matrix
- run.sh runs accuracy when CORTIQ_ROUTER_KEY is set

bench/run.sh

@@ -91,6 +91,13 @@ else
   echo "portkey           | (not installed — npm i -g @portkey-ai/gateway)"
 fi
 
+# --- task-type routing accuracy (optional; needs a live router key) ----------
+if [ -n "${CORTIQ_ROUTER_KEY:-}" ]; then
+  echo
+  echo "== task-type routing accuracy (allaigate router vs keyword heuristic) =="
+  python3 "$HERE/accuracy.py"
+fi
+
 echo
-echo "Note: numbers are gateway overhead over a zero-latency mock on one machine;"
-echo "subtract mock-direct to isolate proxy cost. Re-run on your own hardware."
+echo "Note: latency numbers are gateway overhead over a zero-latency mock on one"
+echo "machine; subtract mock-direct to isolate proxy cost. Re-run on your hardware."