[codex] release 0.2.0 py dependency management

[Pigbibi]

Summary

• Bump platform package version from 0.1.0 to 0.2.0 for the pyproject/uv dependency-management release.
• Refresh uv.lock so the root package version matches the release metadata.

Validation

• uv sync --frozen --extra test --no-install-project
• uv run --no-sync python scripts/check_qpk_pin_consistency.py
• uv run --no-sync python -m pytest -q tests/test_uv_dependency_workflow.py tests/test_dependency_pin_guard.py
• git diff --check

Release note

• This version represents the switch to pyproject.toml + uv.lock as the dependency-management source for CI, Docker, and deployment workflows.