[codex] Add comprehensive root formatting check

[anp-oai]

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

[anp-oai]

@codex review

[chatgpt-codex-connector]

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[chatgpt-codex-connector]

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Reviewed commit: 699944894e

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[anp-oai]

@codex review

[chatgpt-codex-connector]

💡 Codex Review

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Reviewed commit: 1b3f0c3668

ℹ️ About Codex in GitHub

Your team has set up Codex to review pull requests in this repo. Reviews are triggered when you

• Open a pull request for review
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• Comment "@codex review".

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[bolinfest]

@anp-oai I don't think my comments are blocking and I trust you to fix things as you see fit, so approving.

Unblocking #25156 is my higher-level goal here!