CodeAct documentation moved

CodeAct now lives in the optional dspy-code_act gem. The agent lets a model choose and execute Ruby code over several bounded iterations; it is separate from DSPy.rb core because generated-code execution needs a different safety boundary from ordinary prediction.

• Install: gem 'dspy-code_act', '~> 1.0'
• Read the CodeAct documentation.
• Inspect the implementation.

The current implementation evaluates generated Ruby in the application process. Use it for controlled experiments unless you provide process or container isolation.