[WIP] Add ping command to application for health checks

[Copilot]

Plan: Add PING Command Testing

After exploring the repository, I found that:

• The PING command is already implemented in both executor.go and worker.go
• It's already registered in the command switch statements
• However, there are no tests for the PING command

Tasks:

• Explore repository structure and understand existing implementation
• Verify that PING command is already implemented
• Run existing tests to ensure baseline functionality
• Add comprehensive tests for the PING command
• Verify tests pass
• Manual verification with redis-cli (if possible)

Original prompt

add ping command

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