Added simple Counter in counter.py

[opencode-agent]

I added a new file at the repo root with a simple Counter class.

File: counter.py

• Class: Counter
• Methods:
  • increment(amount=1) -> int: increments the counter and returns the new value
  • decrement(amount=1) -> int: decrements the counter and returns the new value
  • get_value() -> int: returns the current value

Usage example:

• c = Counter(10)
• c.increment() # 11
• c.decrement(2) # 9
• c.get_value() # 9

If you’d like, I can add a small README snippet or a couple of quick tests for this.

Closes #697

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