Add skill evaluation dataset for cuopt-lp-milp-api-python (#1172)

## Summary

Initial skill evaluation dataset for `cuopt-lp-milp-api-python` at `skills/cuopt-lp-milp-api-python/evals/evals.json`. 99 entries adapted from the [microsoft/OptiGuide](https://github.com/microsoft/OptiGuide) IndustryOR corpus (MIT, attribution in `evals/SOURCES.md`).

- `ground_truth` is the numeric optimal value; rubric requires exact match to the precision shown (no tolerance)
- `expected_behavior` is generic across all entries — does not pre-categorize as LP vs MILP
- Each entry has a `source` field referencing the dataset row for traceability

QP eval set is out of scope (the corpus has no genuine QP problems) and will follow in a separate PR.

Authors:
  - Ramakrishnap (https://github.com/rgsl888prabhu)

Approvers:
  - Ishika Roy (https://github.com/Iroy30)

URL: #1172

Author: rgsl888prabhu

skills/cuopt-lp-milp-api-python/evals/SOURCES.md

@@ -0,0 +1,40 @@
+# Sources
+
+Eval prompts in `evals.json` for the `cuopt-lp-milp-api-python` skill are
+adapted from the **OptiGuide / OptiMind IndustryOR** dataset:
+
+- Repository: [microsoft/OptiGuide](https://github.com/microsoft/OptiGuide)
+- File: [`optimind/data/optimind_cleaned_classified_industryor.csv`](https://github.com/microsoft/OptiGuide/blob/main/optimind/data/optimind_cleaned_classified_industryor.csv)
+- License: MIT (Copyright (c) Microsoft Corporation)
+
+Each entry's `source` field references the original row index. Problem
+statements are quoted verbatim; ground-truth values are the dataset's
+optimal objective values.
+
+## License
+
+The MIT license under which the source dataset is distributed:
+
+```
+MIT License
+
+Copyright (c) Microsoft Corporation.
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE
+```