spark: add simple word counter tool

wizard-work/spark/test-input.txt

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+Hello world this is test seven words

wizard-work/spark/word-counter-README.md

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+# Word Counter
+
+A simple Python word counter that counts words in a text file.
+
+## Usage
+
+```bash
+python3 word-counter.py <filepath>
+```
+
+## Example
+
+```bash
+$ python3 word-counter.py test-input.txt
+7
+```
+
+## Verification
+
+- 7 words in test-input.txt: PASS
+- 0 words in test-empty.txt: PASS

wizard-work/spark/word-counter.py

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+#!/usr/bin/env python3
+"""Simple word counter - counts words in a text file."""
+import sys
+
+def count_words(filepath):
+    """Count words in a file and return the total."""
+    with open(filepath, 'r') as f:
+        text = f.read()
+    return len(text.split())
+
+if __name__ == '__main__':
+    if len(sys.argv) != 2:
+        print("Usage: word-counter.py <filepath>")
+        sys.exit(1)
+    print(count_words(sys.argv[1]))