chore(toolchain): pin rust-toolchain.toml to stable + rustfmt+clippy components

[KooshaPari]

User description

Bootstraps reproducible Rust toolchain pin per audit: docs/governance/rust-toolchain-audit-2026-04-27.md.

Channel: stable. Components: rustfmt, clippy. Profile: minimal.

Part of org-wide rollout to 22 unpinned Rust repos. Existing nightly pins (AgilePlus, Apisync, HexaKit, pheno, PhenoLang, Stashly, Tasken) are preserved.

Co-Authored-By: Claude Opus 4.7 (1M context) noreply@anthropic.com

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Note

Low Risk
Low risk since it only adds a toolchain pin and formatter/linter components, affecting developer/build environments but not runtime behavior.

Overview
Pins the repository’s Rust toolchain via a new rust-toolchain.toml, standardizing on the stable channel and ensuring rustfmt/clippy are available with the minimal profile.

^{Reviewed by Cursor Bugbot for commit aa2ca63. Bugbot is set up for automated code reviews on this repo. Configure here.}

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CodeAnt-AI Description

Standardize the Rust toolchain for local development and checks

What Changed

• The repository now uses the stable Rust toolchain by default
• rustfmt and clippy are included so formatting and lint checks are available without extra setup
• The toolchain uses a minimal install profile to keep the setup small

Impact

✅ Consistent Rust setup across developers and CI
✅ Fewer formatting and lint tool issues
✅ Smaller toolchain installs

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