clai: Add ability to continue last conversation

[uriyyo]

Hi,

Thanks for clai, I'm using it all the time 🙌

One minor feature that I miss is the ability to continue the last conversation, cause my usage looks like this:

clai "first question"
clai "next question that basically related to first one"

So now it will be possible:

clai "first question"
clai -c "next question that basically related to first one"

I'm not sure if -c is a good option name, as it is usually used for configuration, so maybe -r/--resume would be a better option. I will be happy to update the implementation with better naming.

[hyperlint-ai]

PR Change Summary

Added the ability to continue the last conversation in the clai CLI tool.

• Introduced the '-c' option to continue the last conversation instead of starting a new one.
• Updated usage instructions in the README to reflect the new option.
• Provided a suggestion for renaming the option to '-r/--resume' for clarity.

Modified Files

• clai/README.md

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[uriyyo]

I don't know why coverage is not 100%(