Add inference-only evaluation for EgoSpeak Omni finetuning

docs/easycom_egospeak_omni_finetune.md

@@ -177,6 +177,26 @@ run by this launcher.
 
 ## Local validation
 
+### Evaluate a saved checkpoint without training again
+
+For a completed short continuation, use the separate inference-only CLI:
+
+```bash
+CUDA_VISIBLE_DEVICES=0 python3 -u infer_egospeak_omni_finetune.py \
+  --checkpoint results/easycom_egospeak_omni_finetune_low_lr_1ep_diagnostic_2026-09-16/checkpoint_last.pt \
+  --sessions Session_1 Session_2 Session_3 \
+  --output-dir results/easycom_egospeak_omni_finetune_low_lr_1ep_test_2026-09-16
+```
+
+Feature roots/readout settings inherit the checkpoint; optional
+`--egospeak-feature-root`/`--omni-feature-root` override relocated roots while
+saved extraction contracts are checked. Float32 inference, `pred/valid/raw_eval`,
+dense and threshold-free raw endpoint AP are exported. No optimizer is created
+and the checkpoint is unchanged. This repeated official-test evaluation is
+exploratory; do not choose subsequent parameters or epochs from its scores.
+
+### Tests
+
 ```bash
 python3 -m unittest test_egospeak_omni_finetune test_egospeak_omni_residual -v
 ```