feat: add rust-node-shell devShell

[thedavidmeister]

Slim shell for repos that ship a Rust crate plus a Node/WASM binding (rain.math.float pattern). rust-build-inputs + node-build-inputs + rs-tasks, without the heavy sol/subgraph closure.

Unblocks rain.math.float#221: with rust-node-shell, the package-release workflow can stay fully inside nix and stop mixing actions/setup-node with nix shells.

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Run ID: 6854afbd-b937-4711-a091-5ccd51ce2abe

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Reviewing files that changed from the base of the PR and between d444279 and 9829db7.

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• flake.nix

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 2026-05-23-rust-node-shell

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[github-actions]

@coderabbitai assess this PR size classification for the totality of the PR with the following criterias and report it in your comment:

S/M/L PR Classification Guidelines:

This guide helps classify merged pull requests by effort and complexity rather than just line count. The goal is to assess the difficulty and scope of changes after they have been completed.

Small (S)

Characteristics:

• Simple bug fixes, typos, or minor refactoring
• Single-purpose changes affecting 1-2 files
• Documentation updates
• Configuration tweaks
• Changes that require minimal context to review

Review Effort: Would have taken 5-10 minutes

Examples:

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• Update README with new instructions
• Adjust configuration values
• Simple one-line bug fixes
• Import statement cleanup

Medium (M)

Characteristics:

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• Breaking changes with backward compatibility
• Changes requiring some domain knowledge to review

Review Effort: Would have taken 15-30 minutes

Examples:

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Large (L)

Characteristics:

• Major feature implementations
• Breaking changes or API redesigns
• Complex refactoring across multiple modules
• New architectural patterns or significant design changes
• Changes requiring deep context and multiple review rounds

Review Effort: Would have taken 45+ minutes

Examples:

• Complete new feature with frontend/backend changes
• Protocol upgrades or breaking changes
• Major architectural refactoring
• Framework or technology upgrades

Additional Factors to Consider

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• Test coverage impact: More comprehensive test changes lean toward larger classification
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• Team familiarity: Novel patterns or technologies increase complexity

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