[verified] refresh OpenVINO router classifier prototype

openvino-classifier-npu/README.md

@@ -17,6 +17,7 @@ services, or send external messages.
 - Default port: `18819`
 - Default bind: `127.0.0.1`
 - Upstream: `http://127.0.0.1:18817/v1/embeddings`
+- Batch limit: `OPENVINO_CLASSIFIER_MAX_BATCH_SIZE`, default `32`
 - Model label: `bge-base-en-v1.5-int8-ov/prototype-router-v0`
 - NPU proof: `/sys/class/accel/accel0/device/npu_busy_time_us` before/after plus upstream `npu_busy_delta_us`
 
@@ -90,6 +91,10 @@ cd /home/will/lab/swarm/openvino-classifier-npu
 /home/will/.venvs/npu/bin/python router_classifier.py --host 127.0.0.1 --port 18819
 ```
 
+Environment variables mirror the flags: `OPENVINO_CLASSIFIER_HOST`,
+`OPENVINO_CLASSIFIER_PORT`, `OPENVINO_CLASSIFIER_EMBED_URL`,
+`OPENVINO_CLASSIFIER_TIMEOUT_S`, and `OPENVINO_CLASSIFIER_MAX_BATCH_SIZE`.
+
 Then from another shell:
 
 ```bash
@@ -102,6 +107,15 @@ curl -fsS http://127.0.0.1:18819/v1/classify \
 A valid NPU-backed response must have positive `npu_busy_delta_us`; HTTP 200 by
 itself is not considered proof.
 
+Synthetic fixture smoke helper, after the foreground service is running:
+
+```bash
+/home/will/.venvs/npu/bin/python smoke_classifier.py --base-url http://127.0.0.1:18819
+```
+
+The helper refuses non-local URLs, checks fixture label expectations, and prints
+response plus outer sysfs NPU busy deltas.
+
 ## Tests
 
 Unit tests use a fake embedding client and do not touch the NPU: