chore: latest rainix + soldeer re-lock

[thedavidmeister]

Bumps rainix to latest and re-locks soldeer deps.

• rainix.url -> github:rainlanguage/rainix, nix flake update rainix
• soldeer deps bumped to latest registry versions where behind, then re-locked
• verified via nix develop (latest rainix dev shell)

🤖 Generated with Claude Code

[coderabbitai]

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✨ Finishing Touches

🧪 Generate unit tests (beta)

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

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[thedavidmeister]

Reviewed 9d81661: flake.lock-only change bumping the rainix input to latest main (f22d4dc) + its transitive inputs; no flake.nix/src/test changes. CI green (rainix test/static/legal). Approve.

[thedavidmeister]

Reviewed 9d81661: flake.lock-only change — rainix input 22fa2d3 -> latest main f22d4dc + transitive inputs, drops orphaned nixpkgs-old node. No flake.nix/src/test changes. CI green (rainix test/static/legal). Approve.