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

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[thedavidmeister]

Reviewed 135c1b1: flake-only change — bump pinned rainix to latest main f22d4dc (+ flake.nix url/deadnix cleanup where present). No src/test changes. CI green. Approve.