fix: update compose submodule for Matrix bridge deps + persistent venv
Updates assets/compose submodule to 8adbbf0 (compose fix/matrix-bridge-deps). Compose commit adds: - uv pip install openai mautrix[encryption] to hermes entrypoint - Persistent venv volume at /opt/hermes/.venv - Empty-volume first-boot handling (venv recreation) This ensures Matrix bridge dependencies survive container recreation.
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