feat: implement episode finalization and adjust session support flag

refactor: update server to use searcharena package

refactor: update type hints to use built-in generic types

Refactor inference and logging mechanisms; remove log_utils.py

refactor: update environment variables and reward validation range

updated readme and project.toml

refactor: remove Serper backend support and related configurations

added support for the serper api

enhance reward calculation with F-beta weight and trajectory floor adjustments

wiring up the search environment loop

initial commit