feat: /repeat command

[hux]

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Purpose: To facilitate multi-length or long-running prompt commands. ( Aka: to avoid repeated 'up-arrow-press-enter' fatigue )

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Example: After priming a chat session with test development, executing:

/repeat 5 Please continue with writing test cases until all coverage is reached.

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Additionally for large operations, it comes in handy as well:

/repeat 20 Please align all 200 frontend form fields with their corresponding backend database field each section at a time

Both use-cases are taken from successful real-world scenarios.

[CLAassistant]

All committers have signed the CLA.

[hux]

If it is of interest, here is the prompts I used for this:

I would like to add a command to the running prompt, called /repeat -----    /repeat 5 'Please continue fixing tests'          would result in 5 repeated prompts of 'Please continue fixing test' - each time the LLM was completed with its previous prompt.    Can you please help me plan and implement this?

Please write all needed tests for this too.

Can you make the tests in the tests/basic/test_commands instead of the new file?

I run aider with --no-auto-commit so the commit is just rolled into that one that I manually created. I had to clean up the new test file it generated, but once I told it the right file to modify then it seemed to work well.

[hux]

pytest is failing, so I'm iterating on fixing this.

[hux]

pytest tests/basic/test_commands.py PASSING