## Why
The root formatting entrypoints could drift: `just fmt` did not format
the Justfile itself, and the CI-facing check recipe only checked Python
scripts instead of matching everything formatted by `just fmt`.
## What changed
- Add a shared cross-platform Python formatter driver used by both `just
fmt` and `just fmt-check`.
- Run Justfile, Rust, Python SDK, and internal-script formatter groups
concurrently while buffering each formatter group's output until it
finishes.
- Log formatter starts immediately, then print each formatter group's
labeled output when it completes.
- Keep the SDK lint-fix and Ruff formatting passes ordered, with source
comments explaining their distinct roles and the check-mode equivalents.
- Run Ruff through shared `uv run --no-sync --with ruff` overlays so
formatting works on clean glibc Linux checkouts without installing the
platform-specific SDK runtime wheel.
- Show `fmt-check` help text in `just -l` and simplify CI to call the
shared driver through `just fmt-check`.
- Pin the general CI workflow to `just@1.51.0` so its formatter agrees
with the checked-in Justfile.
- Add regression coverage for the thin Just recipes and the driver's
formatter graph.
## Validation
- `just fmt`
- `just fmt-check`
- `python3 -m pytest
sdk/python/tests/test_artifact_workflow_and_binaries.py -k 'root_fmt or
root_format' -q`
- `pnpm run format`
- `git diff --check`
- `just -l | rg -n '^ fmt|fmt-check'`
- `uvx --from uv==0.7.22 uv run --frozen --project sdk/python --no-sync
--with ruff ruff check --diff sdk/python`
Adam Perry @ OpenAI