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Tail end of the sandbox-tools migration: - Drop ``ENV STRIX_SANDBOX_MODE=true`` and ``ENV PYTHONPATH=/app`` from the Dockerfile — both only mattered for the now-deleted in-container tool server (the legacy ``register_tool`` registry gated on the env var, and the entrypoint set ``PYTHONPATH`` so it could ``-m strix.runtime.tool_server``). - Drop ``strix_disable_browser`` from the Config defaults — the legacy registry used it to skip ``browser_action`` registration; agent-browser is unconditional now. - Strip the ``tool_server.py`` blurb from ``strix/runtime/__init__.py``. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>