How to: Example: TTL=300s, multiplier=3 → data up to 900s old can be returned while refreshing
set -g @powerkit_stale_multiplier "3"
```

**How it works:**

- Fresh data (within TTL): Returns cached data immediately
- Stale data (within TTL × multiplier): Returns stale data immediately, refreshes in background
- Too old data (beyond TTL × multiplier): Blocks and refreshes synchronously

This ensures your status bar never hangs waiting for slow API calls or network requests.

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