chore: initialize monorepo with project scaffolding, configs, and CI setup

apps/miner-node/src/aitbc_miner/util/backoff.py

@@ -0,0 +1,19 @@
+from __future__ import annotations
+
+import asyncio
+import random
+
+
+def compute_backoff(base: float, factor: float, jitter_pct: float, max_seconds: float) -> float:
+    backoff = min(base * factor, max_seconds)
+    jitter = backoff * (jitter_pct / 100.0)
+    return max(0.0, random.uniform(backoff - jitter, backoff + jitter))
+
+
+def next_backoff(current: float, factor: float, jitter_pct: float, max_seconds: float) -> float:
+    return compute_backoff(current, factor, jitter_pct, max_seconds)
+
+
+async def sleep_with_backoff(delay: float, factor: float, jitter_pct: float, max_seconds: float) -> float:
+    await asyncio.sleep(delay)
+    return next_backoff(delay, factor, jitter_pct, max_seconds)