ADR 005 uv-Only Python Tooling

Decision

Python repositories use uv only.

• Keep pyproject.toml and uv.lock as dependency truth.
• Synchronize with uv sync --locked.
• Run Python tools through uv run.
• Do not add project requirements.txt, pip lifecycle commands, Poetry, Pipenv, or manually managed virtual environments.

Implementation Evidence

• Backend Python project configuration
• Backend locked dependency graph
• Assembly quality-gate declaration

Consequences

Upstream pip examples must be translated into uv commands before entering project documentation or automation.