* Embed python artifacts into ax
And setup the AGY harness service at runtime.
* refactor: remove directory and file filtering logic from setup walk function
* refactor: rename installRequirements to install in python sidecar setup
* refactor: simplify Sidecar configuration by passing PYTHONPATH directly to Start method and removing unnecessary environment and binary options
* feat: configure pip install to use local site-packages and filter unwanted files during setup
* feat: support appending to PYTHONPATH and update Python setup path resolution
* refactor: remove redundant file filtering in sidecar setup directory traversal
* refactor: simplify python package installation and add PyPI index URL to pip command
* fix: remove extra index URL from pip install command
* refactor: remove Sidecar.Setup method and move asset extraction logic to external standalone function
* refactor: remove PythonPath configuration field from sidecar.Config in favor of direct global pythonPath usage
* test: remove integration test for antigravity sidecar auto-start logic
* fix: add pypi.org extra-index-url to python package installation command
* refactor: remove Stdin support from pythonsidecar configuration and cleanup redundant harness definitions
