feat: add CodeAct plugin for code-based agent interaction

src/strands/vended_plugins/codeact/__init__.py

@@ -0,0 +1,23 @@
+"""CodeAct plugin for code-based agent interaction.
+
+CodeAct replaces standard tool calling with code-based orchestration.
+The model generates Python code that calls tools as async functions,
+and the plugin executes this code and feeds results back to the model.
+
+Example:
+    ```python
+    from strands import Agent
+    from strands.vended_plugins.codeact import CodeActPlugin
+
+    agent = Agent(
+        tools=[shell, calculator],
+        plugins=[CodeActPlugin()],
+    )
+
+    result = agent("Calculate squares of 1-10 and sum them")
+    ```
+"""
+
+from .codeact_plugin import CodeActPlugin
+
+__all__ = ["CodeActPlugin"]