ci(research): pin the Rustfmt patch release

[proerror77]

Change contract

Pin Prediction Markets CI formatting to Rustfmt 1.91.0 so the repository is checked against the exact formatter version its checked-in sources already satisfy, instead of drifting when a new 1.91 patch is published.

Out of scope

Formatting source files, changing any Rust behavior, changing other CI lanes, or upgrading the toolchain.

Dependency or merge order

None. Merge before rerunning PR #133, whose formatter failure is caused by 1.91.1 reformatting unrelated root-workspace files.

Focused validation

GitHub Linux run 29645348606 checked current main with Rustfmt 1.91.0 using the same cargo fmt --all -- --check command and passed. The failing PR #133 lane resolved toolchain 1.91.1 and reported only unrelated root-workspace formatting drift.

Rollout or rollback impact

CI-only. Rollback is a one-line revert; no runtime or live execution impact.

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📥 Commits

Reviewing files that changed from the base of the PR and between cbb37c5 and e715c0a.

📒 Files selected for processing (1)

• .github/workflows/ploy-ci.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch codex/prediction-rustfmt-patch-pin

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