doc(README): unify usage section and refine evaluation to highlight prototyping intent and need for case-by-case validation

README.md

@@ -26,8 +26,6 @@ This is a parameter-efficient fine-tuning (PEFT) LoRA adapter trained on a struc
 
 ## 🚀 Uses
 
-### Direct Use
-
 This adapter enhances Phi-4-mini-instruct for parsing natural recurrence expressions into DSL format.
 
 Example prompt:
@@ -38,9 +36,7 @@ $ You are a precise parser of recurring schedule expressions. Your only job is t
 < MONTHLY_BY_WEEKDAY(1, TU, 2, TIME(13, 0))
 ```
 
-### Downstream Use
-
-Useful for prototyping DSL-based schedulers, assistants, or natural language interfaces requiring structured recurrence interpretation.
+It is a useful starting point for prototyping DSL-based schedulers, assistants, or natural language interfaces requiring structured recurrence interpretation.
 
 The DSL produced by this model is defined and executed by the [Mini Recurrence Converter DSL module](https://github.com/gh9869827/fifo-dev-dsl/tree/main/fifo_dev_dsl/domain_specific/mini_recurrence_converter_dsl).
 
@@ -61,7 +57,7 @@ print(parsed)
 # Output: structured recurrence rule object
 ```
 
-### Out-of-Scope Use
+## Out-of-Scope Use
 
 This model is specialized for recurrence conversion DSL. It is not intended for general-purpose dialogue or unrelated tasks.
 
@@ -111,7 +107,7 @@ Trained on [a6188466/mini-recurrence-converter-dsl-dataset](https://huggingface.
   - **97.79%** on held-out [test set](https://huggingface.co/datasets/a6188466/mini-recurrence-converter-dsl-dataset) (**221/226** passed)  
     The test set includes 26 hand-curated and 200 [synthetic](https://github.com/gh9869827/fifo-dev-dsl/blob/main/fifo_dev_dsl/domain_specific/mini_recurrence_converter_dsl/generate_synthetic_data.py) examples.
 
-These results demonstrate strong accuracy on tested queries, though the model may still produce incorrect outputs on novel or ambiguous phrasing.
+These results demonstrate strong accuracy on tested queries, but performance should be carefully evaluated in each individual use case.
 
 Evaluation script: [`evaluate_mini_recurrence_converter_dsl_model.py`](https://github.com/gh9869827/fifo-dev-dsl/blob/main/fifo_dev_dsl/domain_specific/mini_recurrence_converter_dsl/evaluate_mini_recurrence_converter_dsl_model.py)