Added fibonacci.py with fib(n) and main

[opencode-agent]

Implemented the fibonacci.py script at the repo root.

What I added

• fibonacci.py
  • Function fibonacci(n)
    • Docstring explaining the definition: F(0)=0, F(1)=1, F(n)=F(n-1)+F(n-2)
    • Iterative implementation with O(n) time and O(1) space
    • Raises ValueError for negative n
  • main block
    • Prints the first 10 Fibonacci numbers: F(0) through F(9)
    • Output format: a single line with numbers separated by spaces
      • Example output: 0 1 1 2 3 5 8 13 21 34

Code (for quick reference)

• fibonacci.py
  • Function:
    • def fibonacci(n):
      • """Return the nth Fibonacci number..."""
      • if n < 0: raise ValueError(...)
      • a, b = 0, 1
      • for _ in range(n): a, b = b, a + b
      • return a
  • Main:
    • if name == "main":
      • line = " ".join(str(fibonacci(i)) for i in range(10))
      • print(line)

This should satisfy Issue #690 requirements:

• Defines fibonacci(n) returning the nth Fibonacci number
• Includes a docstring for the function
• main prints the first 10 Fibonacci numbers

If you’d like a different output format (e.g., one per line) or a different starting index, I can adjust quickly.

Closes #690

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