Adds Counter class; prints 1–10.

[opencode-agent]

Created counter.py at the repository root.

Summary:

• Adds a Counter class with:
  • increment(amount=1)
  • decrement(amount=1)
  • get_value()
• Includes a main function that counts from 1 to 10 and prints each value.

How to run:

• python3 counter.py
• Output: 1 through 10, each on its own line.

Closes #697

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