fix(copro): make eval_kwargs parameter truly optional

[themavik]

Summary

Fixes #9080

The COPRO.compile() method documents eval_kwargs as an optional parameter, but the implementation requires it as a mandatory keyword-only argument. Calling compile() without eval_kwargs raises a TypeError.

Changes

• Changed eval_kwargs default from no-default to None in compile() signature
• Added or {} guard when unpacking eval_kwargs to safely handle None

Before

# TypeError: compile() missing 1 required keyword-only argument: 'eval_kwargs'
compiled = teleprompter.compile(program, trainset=trainset)

After

# Works — eval_kwargs defaults to None, unpacks as empty dict
compiled = teleprompter.compile(program, trainset=trainset)

# Still works with explicit kwargs
compiled = teleprompter.compile(program, trainset=trainset, eval_kwargs={"num_threads": 4})

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