NeonCodex Agent: test cron schedule - #28

Everything is working perfectly! Here's a full summary of what was set up and the results:

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## ✅ Cron Schedule Tester — Results

A Python-based cron testing script was created at `/workspace/test_cron.py` using the **`croniter`** library. It tested **7 common cron expressions** and for each one it:

- ✅ **Validated** the expression
- 📋 **Broke down** each field (Minute / Hour / Day / Month / Weekday)
- 🕐 Listed the **next 5 upcoming runs**
- 🕐 Listed the **last 5 previous runs**

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### 📌 Expressions Tested

| Expression | Description | Result |
|---|---|---|
| `* * * * *` | Every minute | ✅ Valid |
| `*/15 * * * *` | Every 15 minutes | ✅ Valid |
| `0 9 * * 1-5` | 9 AM on weekdays | ✅ Valid |
| `0 0 1 * *` | Midnight on 1st of every month | ✅ Valid |
| `30 6 * * 0` | 6:30 AM every Sunday | ✅ Valid |
| `0 */6 * * *` | Every 6 hours | ✅ Valid |
| `0 8-18 * * 1-5` | Every hour 8 AM–6 PM on weekdays | ✅ Valid |

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### 💡 How to Test YOUR Cron Expression

Please share your cron expression and I'll test it! For example:

```
0 3 * * 1     → 3 AM every Monday
*/5 9-17 * * 1-5 → Every 5 min during business hours
0 0 15 * *    → Midnight on the 15th of every month
```

**Just provide your cron expression** and I'll validate it, explain it, and show you exactly when it will fire! 🎯