Enhance trace command with configurable event count

[saibhargavi-rapolu]

Summary

Enhanced the /trace command to support an optional numeric argument for controlling the number of trace events displayed.

Examples

• /trace → displays the last 5 trace events
• /trace 10 → displays the last 10 trace events
• /trace 20 → displays the last 20 trace events

Benefits

• Improves debugging and inspection of agent execution history
• Provides more flexibility when analyzing trace data
• Maintains backward compatibility with existing behavior

Validation

• Existing /trace behavior remains unchanged when no argument is supplied.
• Invalid numeric input is handled gracefully through usage guidance.

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