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"""
retry.py — Exponential backoff retry decorator for API calls.

Usage:
    @retry(max_attempts=3, backoff_factor=2)
    async def call_api(url: str) -> dict:
        async with aiohttp.ClientSession() as session:
            async with session.get(url) as resp:
                resp.raise_for_status()
                return await resp.json()
"""
import asyncio