Send a push notification to the user's phone via ntfy.

Usage:
- `/pingme` — sends a generic "ready for your attention" ping
- `/pingme Your message here` — sends the given message
- `/pingme Your message --title "Custom Title"` — message with custom title
- `/pingme Your message --priority high` — high-priority notification

## Steps

Run the ntfy tool with the user-provided message (or a default if none given):

```
python3 tools/ntfy.py "<message>" --title "<title>"
```

**Defaults when no arguments provided:**
- message: `"Claude is ready for your attention"`
- title: `"TradingBot25"`

**With a message argument:** use the provided text as the message body.
**With --title:** pass through to `tools/ntfy.py --title`.
**With --priority:** pass through to `tools/ntfy.py --priority`.

After sending, confirm to the user: "Ping sent."