lib: add update-rainix.sh helper for bumping consumers

[thedavidmeister]

Adds lib/update-rainix.sh, a helper that bumps a rainix-consuming repo to the latest rainix and re-locks Soldeer. Run from a consumer repo root; it makes local changes only.

What it does:

• points the rainix flake input at github:rainlanguage/rainix and runs nix flake lock --update-input rainix
• normalises flake.nix for the current lint hooks — ensures the outputs argument set ends with ... (so deadnix can drop an unused self without breaking evaluation), then runs deadnix/statix/nixfmt
• for Solidity repos, re-locks Soldeer (forge soldeer install) + sanity forge build

Soldeer dependency version bumps are intentionally left to the developer (edit foundry.toml, forge soldeer update, fix version-suffixed imports), since bumping blindly can break builds when a transitive dependency pins an older version with recursive_deps = false.

This is the distilled, in-place form of the script used to open the org-wide "latest rainix + soldeer re-lock" PRs.

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

Configuration used: Path: .coderabbit.yaml

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📥 Commits

Reviewing files that changed from the base of the PR and between f22d4dc and 0a9d771.

📒 Files selected for processing (2)

• README.md
• lib/update-rainix.sh

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch 2026-06-01-update-rainix-helper

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