chore: integrate mr boxington for rust builds

[nicholasadamou]

Why this PR is necessary

• Rust CI recompiles shared crates across jobs without a rustc action cache.
• Target-dir caches (Swatinem) are coarser and do not share work the way mbx does.

Summary

• Switch CI to jdx/mr-boxington-action and mbx for build/test/clippy/run
• Keep cargo fmt, cargo install, and cargo deny as plain cargo
• Flox/docs updated for local mbx (dotagent: docs/hooks only)

Test steps

• CI green on this PR
• Confirm rust-cache steps are gone and mbx precedes compile commands after toolchain install

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Summary by CodeRabbit

• Documentation

  • Updated quickstart and development guidance to use the mbx command wrapper for running, building, testing, and linting.
  • Clarified that formatting and installation continue to use standard Cargo commands.

• Chores

  • Updated automated checks, release builds, and pre-commit validation to use the standardized mbx workflow.
  • Improved shared build-cache handling across development and CI environments.

[coderabbitai]

Caution

Review failed

The pull request is closed.

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro Plus

Run ID: a5303e7e-1523-44cf-940c-66415a32c7a4

📥 Commits

Reviewing files that changed from the base of the PR and between 3ef381b and 90ca901.

📒 Files selected for processing (5)

• .githooks/pre-commit
• .github/workflows/ci.yml
• .github/workflows/release.yml
• AGENTS.md
• README.md

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📝 Walkthrough

Walkthrough

The pull request replaces supported Cargo test, lint, build, and run commands with mbx, adds the Mr. Boxington action to CI and release workflows, and documents the updated developer workflow. Formatting and installation continue to use Cargo.

Changes

Mr. Boxington command adoption

Layer / File(s)	Summary
Local commands and developer guidance .githooks/pre-commit, AGENTS.md, README.md	Pre-commit checks and documented test, lint, build, check, and run commands now use mbx. cargo fmt and cargo install remain unchanged.
CI workflow integration .github/workflows/ci.yml	The CI workflow adds read-only repository contents permission, replaces Rust cache steps with jdx/mr-boxington-action@v1, and runs test, lint, and build commands through mbx.
Release workflow integration .github/workflows/release.yml	The release workflow replaces Rust cache steps with jdx/mr-boxington-action@v1 and runs test, lint, build, and release binary commands through mbx. The formatting check remains unchanged.

Estimated code review effort: 2 (Simple) | ~10 minutes

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/integrate-mr-boxington

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