Prepare bare-metal 1.0 release

[GHoon-Lee]

Summary

• Bump package metadata and lockfile to 1.0.0.
• Update README release status and manual GitHub Release asset examples for v1.0.0.
• Add CHANGELOG.md with bare-metal 1.0 release notes.
• Mark PR C complete and PR D local release prep checks complete in project docs.

Verification

• uv lock --check
• uv run ruff check
• uv run ruff format --check
• uv run mypy
• uv run pytest
• uv run gpu-usage-audit version
• env GITHUB_REF_NAME=v1.0.0 uv run python scripts/check-tag-version.py
• uv build --out-dir /tmp/gua-dist-1.0.0-prep
• bash scripts/smoke-dist-wheel.sh /tmp/gua-dist-1.0.0-prep/gpu_usage_audit-1.0.0-py3-none-any.whl

Remaining before tag

• Run the acceptance flow on an actual NVIDIA bare-metal host.
• After merge, push v1.0.0 to trigger GitHub Release and PyPI publish.