Navaneedan S

feat: add streams concept

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# pull request Closes #2982 --- Reviewer Resources: [Track Policies](https://github.com/exercism/java/blob/main/POLICIES.md#event-checklist)

feat(concepts): add Streams concept

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### 📘 Description This issue proposes the addition of a new **Streams** concept to the Java track on Exercism. #### 🔹 Concept Overview Java Streams offer a functional and declarative...

Add edge case tests for prompt validation

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Fixes #316 ## Description This PR adds three new edge case tests to improve test coverage for the prompt validation module, addressing gaps in error handling and boundary condition testing....

## Problem The prompt validation test suite lacks coverage for important edge cases that could cause unexpected behavior in production. ## Proposed Solution Add three new test cases to `tests/prompt_validation_test.py`...