Enable Python bytecode compilation in UV for faster cold starts

[bcherry]

Summary

This change enables Python bytecode compilation during the UV package installation phase to reduce agent cold-start time by pre-compiling Python source files to .pyc format.

Key Changes

• Added UV_COMPILE_BYTECODE=1 environment variable to the Docker base stage
• This causes UV to compile all Python source code to bytecode during the build phase rather than at first import

Implementation Details

By pre-compiling Python source to bytecode during the Docker build, the first import of Python modules no longer incurs the compilation cost. This trades a slightly longer build time for significantly faster agent startup, which is beneficial for cold-start scenarios. The change is applied in the base stage so it affects all subsequent build stages.

https://claude.ai/code/session_01UD9HXN6LC1bHa9c8D2EVHN

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