Add CI pipeline for variant 5

ci_lab/__init__.py

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+"""Small utility package for CI laboratory work."""

ci_lab/math_tools.py

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+"""Mathematical helper functions."""
+
+def average(numbers: list[float]) -> float:
+    if not numbers:
+        raise ValueError("numbers must not be empty")
+    return sum(numbers) / len(numbers)
+
+def median(numbers: list[float]) -> float:
+    if not numbers:
+        raise ValueError("numbers must not be empty")
+    sorted_numbers = sorted(numbers)
+    length = len(sorted_numbers)
+    middle = length // 2
+    if length % 2 == 1:
+        return sorted_numbers[middle]
+    return (sorted_numbers[middle - 1] + sorted_numbers[middle]) / 2
+
+def is_even(number: int) -> bool:
+    return number % 2 == 0

ci_lab/text_tools.py

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+"""Text helper functions."""
+
+def normalize_text(text: str) -> str:
+    return " ".join(text.lower().split())
+
+def word_count(text: str) -> int:
+    normalized = normalize_text(text)
+    if not normalized:
+        return 0
+    return len(normalized.split(" "))
+
+def unique_words(text: str) -> set[str]:
+    normalized = normalize_text(text)
+    if not normalized:
+        return set()
+    return set(normalized.split(" "))